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Asus Crosshair IV Extreme AMD 890FX Motherboard
Date: Mar 09, 2011
Author: Joel Hruska
Introduction & Specifications

One of the unfortunate consequences of AMD's inability to match Intel's performance at the ultra high-end of the CPU market over the past few years is that there's been a substantial decline in the number of high-end AMD motherboards. NewEgg presently stocks just two AMD motherboards in the $200-$300 price range compared to 36 Intel products. That's not to imply that you have to pay $200 or more for a quality motherboard but it clearly implies that when motherboard manufacturers are thinking about enthusiasts, they're also thinking about Santa Clara.

With one exception.

Both of the $200+ AMD boards are built by Asus and the company recently sent us its top-end AMD offering. The motherboard's retail price point of $299 dwarfs anything else anyone offers in an AMD flavor these days, but Asus has packed the Crosshair IV Extreme with every goody you can think of.

Asus Crosshair IV Extreme
Specifications & Features
Processor Support 
AM3 Phenom II / Athlon II Processors
Supports 140W CPU
AMD Cool'n'Quiet

 AMD 890FX/SB850

4 x DIMM, Max. 16GB, DDR3 2000(OC) 1600/1333/ 1066MHz Non-ECC, Unbuffered RAM
Dual Channel
Asus Allows For DDR3-1333 Support
Expansion Slots 
5 x PCIe 2.0 x16 (x16 speed) (total)
3 x PCIe 2.0 x16 (x16 speed) or
4 x PCIe 2.0 x16 x16/x16 x8/x8)

Multi-GPU Support:
Supports Lucid HydraLogix Technology
Suports ATI Quad-GPU CrossFireX Technology

SB850 Chipset
6 x SATA 6.0Gb/s ports
Supports RAID 0, 1, 5, 10

2 x JMicron 363 Controllers
2 x SATA 3Gb/ports (gray)
1 x Power External SATA 3Gb/s ports at rear
1 x External SATA 3Gb/s ports at rear

8-Channel High Definition Audio codec
Blu-ray audio layer, supports jack-detection, multi-streaming, Front Panel Jack-Retasking

1 x Intel Gigabit LAN

1 x IEEE1394a Internal
1 x IEEE1394a External
-x USB 3.0/2.0 ports at rear
2 x AMD SB850 chipset
-x USB 2.0/1.1 ports (6 ports at mid-board, 6 ports at rear, 1 port at rear also used for ROG connect).

1 x PS/2 keyboard port (purple)
2 x External SATA
1 x S/PDIF Out (Optical)
1 x IEEE 1394a
8-channel Audio I/O
1 x Clr CMOS
2 x USB 3.0/2.0 ports
1 x ROG Connect On/Off Switch
1 x RC Bluetooth Switch
Internal I/O Connectors
3 x USB Connectors support additional 6 x USB 2.0 ports
1 x IEEE 1394 connector
1 x S/PDIF Out connector
Front panel audio connector
System Panel connector
8 x SATA connectors
8 x Fan connectors
7 x Probelt measurement points
3 x Thermal sensor connectors
1 x 24-pin ATX power connector
1 x 8-pin ATX 12V power connector
2 x EZPlug Connectors (4-pin Molex)
1 x OC Station header
1 x Bluetooth Header
1 x Core Unlocker Switch
1 x power switch
1 x Reset switch
1 x Go Button
1 x BIOS switch button
1 x Fan connector for thermal module
1 x ROG light connector

Form Factor
E-ATX Form Factor
12 inch x 10.6 inch

The Crosshair IV Extreme isn't actually an E-ATX motherboard, but its width of 10.6" is one inch wider than the official ATX spec supports. To determine if the board will fit in your case, measure one inch from the last set of mount spacers on the right and add at least a few tenths of an inch for wiggle room. Most cases will support the board, but those with interiors that conform to the ATX spec with laser-cut precision are out-of-luck.

The Crosshair IV Extreme, like most high-end boards these days, is explicitly aimed at the ultra-high-end overclocking crowd and offers a number of OC-friendly features in an attempt to court this rare species of computer enthusiast. Because so few users actually push their systems as far as that group, we'll be explicitly evaluating the CIV-Extreme's features that might prove useful to the more typical user and thus help justify the higher purchase price to a broad audience.
Included Bundle, Hardware Features
Asus includes a USB 2.0/FireWire 1394a PCI bracket, six SATA cables (4x6G, two 2x3G), a Bluetooth receiver, S/PDIF cables, Crossfire/SLI bridges, Asus' handy Q-connector for the various front panel indicator lights/power switch, and multimeter cables for enthusiasts who want to check voltage outputs directly rather than relying on the BIOS reports. There's also a set of three thermal probes for monitoring specific hot spots (don't try to put these between the CPU and heatsink).

Most of the value-added components that ship with the Crosshair IV-E are hardware-based, but there are a few exceptions. The company's driver CD contains the usual suite of tools, anti-virus software, and various overclocking/system monitoring utilities; Asus noted to us that it's completely redesigned the way its tools interlock and function to streamline usage and make things less confusing. The disc also contains a pre-loaded Linux distro and a full licensed copy of 3DMark Vantage. 
Asus MemOk!

Asus' MemOk! button is the smallest button at the lower left. It doubles as the "Go Button," which can be used to automatically restore a preset BIOS profile after a firmware reset.  Note that the right-hand shot is from an earlier board revision; the button positions changed slightly in the final product.

The Crosshair IV Extreme isn't the first Asus board we've tested that featured the company's MemOk! compatibility technology, but we actually needed to use it at one point during this particular review. We are, therefore, able to verify that the function works (mostly)  as advertised; activating MemOk! allowed the system to successfully and stably boot a RAM configuration that otherwise refused to POST.

MemOk!'s status display after successfully booting our system

According to Asus, activating MemOk! is only supposed to change RAM timings. In our tests, using MemOk! also reset all BIOS settings. This was not an issue; we were able to re-set and save our other BIOS settings with no problem.

PCI-E On / Off Switches

The PCIe switches can be seen in the right-hand photograph above. Enthusiasts who want to conserve power or are trying to break overclocking records can manually disable each of the Crosshair IV's five auxiliary PCI-Express ports by flipping the appropriate switch(es).

Various Buttons And Status LEDs

The Crosshair IV Extreme's BIOS can be reset via an external button on the back plate. There are also three independent LEDs that shine green, yellow, or red depending on voltage settings. The Go, power, reset, and Asus core unlocker buttons located in the upper north quadrant of the board are extremely useful if you're fine-tuning certain settings or setting it up for the first time. The core unlock button only does something if your CPU has deactivated cores, but it's a useful way to make sure one's CPU cores remain unlocked even after a BIOS restore.

BIOS Protections

The BIOS swap button

BIOS protection is a major feature of the Crosshair IV. The board features two independent BIOSes on two different physical chips—if one becomes corrupted or physically damaged, switching to the second is as simple as pushing a button. The two are maintained completely independently, there's no way for problems with BIOS #1 to impact BIOS #2.

Profiles can be saved and titled on each BIOS—it's possible, for example, to save all overclocking settings to the first BIOS chip while customizing fail-safes for BIOS #2. Additionally, it's also possible to restore a proper BIOS even if neither of the installed images will POST.

The BIOS can be reflashed by inserting a USB flash drive with the appropriate image and holding down the iROG connector on the back of the motherboard until it flashes. If, by some quirk of fate, all of these options fail, the chips themselves are removable/replaceable.

ROG / RC Bluetooth

The Crosshair IV Extreme incorporates Asus' ROG (Republic of Gamers) processor; this chip enables several different overclocking-friendly options. Enthusiasts can either overclock the Crosshair IV Extreme via a second system over USB or alternately use Bluetooth and a mobile phone to perform the same tasks. Touch phones, including the iPhone, are not supported.

If overclocking isn't your cup of tea, the included BlueTooth radio is also compatible with standard BlueTooth devices—any BT device that works with your phone should theoretically be able to double up and function on the PC. 
BIOS Options

Asus Crosshair IV Extreme
American Megatrends
The Crosshair IV Extreme's BIOS offers control over nearly every feature there's a name for. As always, we recommend only adjusting those settings you understand (or look up first).


The CIV-E is loaded with BIOS options and configurable functions as befits an enthusiast board at this price point. End-users can save specific profiles, monitor thermal probe temperatures, or even opt to disable all integrated peripherals save for the Ethernet adapter (Asus claims this may improve overclocking stability.)

A variety of system voltages and settings are available for tweaking; enthusiasts who want to individually tune each core for maximum performance can do so via Asus' Core Unlocker technology. The lower-right-hand corner shows the standard set of temperatures as well as the three optional thermal connectors (two of which are not hooked up in this image).

LEDs on the motherboard will change color to match the BIOS display--push CPU voltage into the red zone, for example, and you'll see a warning light both in the BIOS and on the board itself. End users have control over a wide range of features and settings; overclockers are free to optimize to their heart's content.
Lucid Logix Support

Lucid Logix HydraLogix 200
The Asus Crossfire IV 's integrated HydraLogix 200 series SoC theoretically allows for an unprecedented level of GPU scaling as well as the ability to use multiple GPUs from different product generations. The chip works, but our testing revealed important caveats.

The HydraLogix chip aboard the Crosshair IV is an LT24102-A1 processor, as shown below. This chip is substantially more powerful than first-generation Hydra 100 processors. Compared to its predecessor, the LT24102 offers twice the bandwidth and can serve up to four x8 PCIe slots compared to just two x16 slots for the 100 series.

The Lucid processor incorporates a 32-bit RISC 'Diamond' processor built by Tensilica and clocked at 300MHz with a 64K L1 instruction cache and a 32K data cache. The diagram below shows how Asus has incorporated the LT24102 into the CrossHair IV Extreme.

Those would be GPU slots #2, #4, and #5

The Crosshair IV effectively contains two separate PCI-Express implementations. Users wanting to build a standard AMD CrossFire system are advised to use slots 1 and 3, both of which tie into AMD's 890FX controller. Enthusiasts who want to use more than three ATI GPUs (A-Mode), a mixed ATI/NV solution (X-Mode) or multiple Nvidia GPUs (N-Mode) should avoid slot three altogether. On paper, Hydra should be a drop-in replacement for Nvidia's SLI, but our performance tests were decidedly erratic.

Probing the Problem:

The major, full-stop problem with the Hydra engine is that it's currently impossible for us to predict either the degree of scaling Hydra will offer in a particular title or whether that title will be supported at all.  When the Hydra Control Panel is first installed, it displays a list of more than one hundred ostensibly-supported titles. We can't comment on the accuracy of this list when using GT200, G92, or G80-based GeForce cards, but current support for Fermi-based products is limited.

After a great deal of benchmarking and repeated conversations with Asus and LucidLogix, we've compiled a list of supported (and unsupported) games and benchmarks using the 1.7.104a 64-bit Hydra drivers released on January 17, 2011. (We also tested the 1.7.103 drivers released in December and multiple WHQL driver releases from Nvidia).

LucidLogix Hydra
Officially Tested Titles


Supported Games:
  • Aliens vs. Predator
  • Batman: Arkham Asylum
  • Battlefield: Bad Company 2
  • Call of Duty: MW2
  • Crysis Warhead
  • Devil May Cry 4
  • HAWX
  • Left 4 Dead
  • Left 4 Dead 2
  • Lost Planet 2 (DX9)
  • Mafia 2
  • Medal of Honor
  • Metro 2033
  • Resident Evil 5
  • Street Fighter IV
  • Starcraft 2
Synthetic Benchmarks:
  • Unigine
  • 3DMark 2006
  • 3DMark Vantage
  • 3DMark 11*
Unsupported Games (Using 1/17  Drivers):
  • Civilization V
  • Crysis (Original)
  • Crysis Wars
  • DiRT 2
  • F1 2010
  • Far  Cry 2
  • Half Life 2
  • Half Life 2 Episode 2
  • HAWX 2
  • Just Cause 2
  • Lost Planet 2 (DX11)**
  • S.T.A.L.K.E.R. Call of Pripyat
  • Team Fortress 2 (including beta version)
  • World of Warcraft***

* - Current support for 3DMark 11 is limited. All four GPU tests scale in Performance mode, but only one test scales across both GPUs in 'Extreme' mode.
** - Lost Planet 2 refused to run in DX11 at all, period. The game scaled in DX9.
*** - World of Warcraft refused to run in DX11 mode. It ran in DX9 mode but did not scale.

There's no common factor that separates the games that do work and those that should but don't. We discussed this at length with LucidLogix's Offir Remez, who pointed out that Lucid has been shipping hardware for barely a year, only recently added support for Fermi-based GPUs, and tests an enormous number of GPU configurations. He told us that Lucid is aware of the issues above, and he promised we'd have seen far more compatible games if we'd been testing with older GT200-based NV cards.

The Bottom Line:

We appreciate Lucid's willingness to openly discuss these support issues and agree that it takes time to ramp any multi-GPU solution; both SLI and Crossfire suffered significant growing pains in their early years. Understandable difficulties, however, don't change the fact that as of this writing, HydraLogix technology is not an effective SLI replacement.

We expect the number of Fermi-supported titles to improve as further drivers are released and believe that LucidLogix is committed to consistent driver improvement. Given sufficient time to bake, HydraLogix could one day provide a level of support substantially equivalent to SLI. For now, buyers looking for an SLI equivalent when using Fermi-class products should look elsewhere.
System Configuration, SiSoft Sandra
Our two AMD test systems were configured identically save for the necessary difference in RAM type and speed due to their differing chipsets. Both systems were equipped with 6GB of RAM. The M3A78-T board used DDR2-800—this 780GX-based board has never been fond of DDR2-1066. The Crosshair IV Extreme used Corsair DDR3 rated for 1600MHz but we purposefully backed down to 1333MHz which is the highest, officially supported speed of the 890FX chipset.
 HotHardware's Test Systems
 Authentic AMD

Asus M3A78-T
BIOS 1907 (10/22/2010)
AMD 780GX Chipset

Asus Crosshair IV Extreme
BIOS 0502 (11/19/2010)
AMD 890FX Chipset

AMD Phenom II X6 1100T
(3.3GHz - 3.7GHz (Turbo Core))


Corsair DDR2-800

Corsair DDR3-1600@1333MHz
DDR3-1600 (8-8-8-24)

Graphics Card:
Nvidia GTX 480 (x2)

Hard Drive:
Corsair F120 SDD
WD Caviar Black 1TB

Windows 7 Professional 64-bit
Nvidia Forceware 260.99

Note:  We used one GeForce GTX 480 in each system, save when testing Lucid Logix support.

SiSoft Sandra 2010 SP1
Synthetic Benchmark Performance

We began testing with SiSoftware's SANDRA, which stands for System ANalyzer, Diagnostic and Reporting Assistant. We examine a CPU's multimedia and arithmetic performance using Sandra, as well as the motherboard's peak memory bandwidth. The difference between the two platforms should be minor given their identical configurations.

Sandra shows precious little difference between the two motherboards. The one exception is the memory test, where the Crosshair IV Extreme has an obvious advantage.
LAME MT, PCMark Vantage

LAME MT MP3 Encoding Test
Single and Multiple threaded Audio Encoding
In our custom LAME MT MP3 encoding test, we convert a large WAV file to the MP3 format, which is a popular scenario that many end users work with on a day-to-day basis to provide portability and storage of their digital audio content. LAME is an open-source mid to high bit-rate and VBR (variable bit rate) MP3 audio encoder that is used widely around the world in a multitude of third party applications.  W
e created our own 223MB WAV file and converted it to the MP3 format using the multi-thread capable LAME MT application in both single and multi-threaded modes. Processing times are recorded below, listed in seconds. Shorter times equate to better performance.

The times here slightly favor the CIV-E but the difference is tiny.

Futuremark PCMark Vantage
Simulated Application Performance
We then ran our motherboards through PCMark Vantage, Futuremark’s latest system performance metric built especially for Windows Vista and Windows 7. PCMark Vantage runs through a host of different usage scenarios to simulate different types of workloads, including High Definition TV and movie playback and manipulation, gaming, image editing and manipulation, music compression, communications, and productivity. Most of the tests are multi-threaded as well, so they can exploit the additional resources offered by multi-core CPUs. We used the 64-bit version of the benchmark, with patch 1.02 installed.

Here the boards essentially tie; the three percent gap between them is well within a typical margin of error for this benchmark.
3DMark Vantage, Low-Res Crysis

Futuremark 3DMark Vantage
Synthetic DX10 Performance

3DMark Vantage

Futuremark's synthetic 3D gaming benchmark, 3DMark Vantage, is specifically bound to Windows Vista-based systems because it uses some advanced visual technologies that are only available with DirectX 10. With this latest version of the benchmark, Futuremark has incorporated new graphics tests, CPU tests, several feature tests, and support for the latest PC hardware. We tested the graphics cards here with 3DMark Vantage's Extreme and Performance preset options.

We saw a small performance difference in 3DMark but again, only by about two percent. The M3A78-T has kept pace remarkably well thus far.

Low-Resolution Gaming: Crysis
Taking the GPU out of the Equation

For our next set of tests, we moved on to some low-resolution in-game benchmarking with Crysis. When testing processors and motherboards in these games, we drop the resolution to 800x600 and reduce all of the in-game graphical options to their minimum values to isolate CPU and memory performance as much as possible. However, any in-game effects, which control the level of detail for the games' physics engines and particle systems, are left at their maximum values, since these actually do place some load on the CPU rather than GPU.

In Crysis we saw the largest difference yet with the Asus Crosshair IV Extreme pulling ahead of the older 780GX configuration.
Cinebench 10 & 11

Cinebench R10
3D Rendering

Cinebench R10 has since been superseded by the 11.5 version but we've continued to include it with a nod to backwards continuity. One of the hallmarks of CB11.5, however, is that it makes much more efficient use of more than four cores.

Cinebench R11.5 64bit
Rendering Performance

Cinebench R11.5

Cinebench 11.5 is the latest update to Maxon's 3D rendering benchmark suite and the third major iteration of the Cinebench series. As with R10, CB11.5 includes a single-threaded, multi-threaded, and OpenGL test. We've focused on the first two tests as part of our processor comparison; the OpenGL test is a GPU-specific benchmark and is meant to represent professional graphics performance. Scores between the two benchmarks are not directly comparable, although it is possible to render R10's workload using 11.5, should you feel inclined.

Eyeball the results above and you'll note a persistent gap between the M3A785-T and the Asus Crosshair IV Extreme—a gap that refused to go away, despite multiple test runs. Since Cinebench is processor-centric by design, it was odd to see a performance difference here as opposed to a program that's more memory speed dependent.

After a little sleuthing we found the problem. The M3A78-T fully supports AMD's latest Thuban, but some aspect of the motherboard's support for Cool'n'Quiet doesn't seem to be working properly. Specifically, the CPU wasn't always holding to its stock operating speed of 3.3GHz. The individual cores were automatically cycling down to lower speeds as if they weren't in use, thereby slowing the overall rendering time.

We were able to correct this by using AMD OverDrive to manually set and lock all six cores to 3.3GHz. Once we did so, performance equalized between the two motherboards.
Audio Quality

Crosshair IV Extreme's Audio
Rightmark Audio Analyzer

Asus doesn't talk up the CIV-E's audio as a major selling point and the chip itself is a bog-standard Realtek ALC889. Its performance, therefore, caught us by surprise.

At the 44kHz/16-bit settings we didn't notice the Crosshair IV Extreme distancing itself from the competition in any significant way. Things changed at the 96kHz / 24-bit level.

At 24-bit/96kHz, however, the Crosshair IV Extreme distinguished itself by beating every other sound card / onboard audio chip that we've tested to date. We've included a breakdown of scores in particular areas below; the system's audio quality is very good across the board.

For those of you who don't feel much like clicking, the purple bar is the Crosshair IV Extreme. We ran the tests multiple times and the results remained consistent across reboots and other types of gaming / audio testing.
Overclocking, Power Consumption
 Overclocking the Asus Crosshair IV Extreme
  Getting out what you put into it
Overclocking is not an exact science. Every processor is different and many factors can influence what a processor is capable of. These factors include complementary components like the motherboard, memory, power supply and cooling. In addition, user experience definitely comes into play as there is an abundance of modifiable settings within most BIOSes (this is particularly true of the Crosshair IV Extreme.)

In this case, we were primarily concerned with whether or not our Thuban X6 1100T would perform differently with the Crosshair IV Extreme as opposed to the venerable-but-overclocking-friendly M3A78-T. We tested the CPU on both air and using a single-stage phase-change unit. On air, the CPU topped out at 1.40v and 4GHz on both chips. The phase change cooler, however, produced somewhat different results.

Once we cooled the chip down to -50C, we saw more of a difference between the two motherboards. While the X100T topped out at 4.1GHz on the older AM2 board, the AM3 Crosshair IV Extreme had a bit more punch. Here, we saw a maximum stable speed of 4.4GHz--an increase of about seven percent.


Power Consumption
One of the things we were curious about was whether or not the price premium on the Crosshair IV Extreme would translate into improved power draw. We've seen multiple high-end boards offering this sort of improvement on the Intel side and wanted to see if Asus would bring it over to its AMD portfolio.

The benefits of the Crosshair IV's design aren't going to make a financial difference to anyone's power bill, but it's nice to see that the advantage is there.
Performance Summary: The Crosshair IV Extreme offers some of the best performance, overclocking, and general features of any 890FX-based motherboard available to date. It's overclocking and lower power consumption are features that may only appeal to certain audiences, but they're still packed in. The onboard audio is very good, the various BIOS protections make it all but impossible to hose the motherboard without using an axe, and it's currently one of just two motherboards that supports Nvidia multi-GPU configurations, even if the state of said support is rather shaky. Even with this caveat, it's the nicest AMD board we've seen in-house in quite some time.

If existing AM3 products were Bulldozer-compatible and LucidLogix's game support was more mature, this motherboard would be a must-have for any AMD enthusiast. Unfortunately, this is not the case; a fact that leaves the Crosshair IV Extreme on uneasy ground.

The Crosshair IV Extreme makes the most sense for an AMD fan who simultaneously wants to experiment with overclocking / core unlocking and doesn't see an upgrade in the near future. Anyone moving from a dual-core/quad-core AM2 system will notice the performance difference and Thuban, while not as powerful as some of Intel's Core i5/i7 products, still offers a good price/performance ratio of its own.

As we've noted on other occasions, there's no reason to think that a $300 board will magically offer better reliability or compatibility than a $150 board, simply by being more expensive. That said, the Crosshair IV Extreme impresses on virtually every front. Buyers who are aware of the Lucid Logix and Bulldozer-related caveats will find that it's easily the nicest, most overclocking-friendly, and feature-packed AMD motherboard currently available.


  • Good performance
  • Excellent features
  • USB 3.0 and SATA 6Gb/s
  • Great audio
  • LucidLogix support a work in progress
  • Certain features may appeal only to niche audience

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