AMD Radeon HD 7770 and 7750 GPU Reviews - HotHardware

AMD Radeon HD 7770 and 7750 GPU Reviews

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As we’ve mentioned, the Cape Verde GPU powering the Radeon HD 7700 series cards is based on the Graphics Core Next (GCN) architecture and has the same feature set as its higher-end counterpart found on the Radeon HD 7900 series.

AMD Cape Verde GPU Features

Like Tahiti, Cape Verde is comprised of roughly 1.5 billion transistors and is manufactured using TSMC’s advanced 28nm process node. The Cape Verde GPU, however, is outfitted with a maximum of 640 stream processors (to Tahiti’s 2,048) arranged in 10 compute units with 64 stream processors each. Cape Verde also sports 512KB of L2 R/W cache, 16 ROPs, 40 texture units, and a 128-bit GDDR5 memory interface. According to AMD, the die size of the chip is a relatively small 123 square millimeters.

Although Cape Verde is pared down to target more mainstream market segments, it doesn’t skimp on any features. With fewer stream processors, ROPs, and texture units, and a narrower memory interface, performance will be lower than Tahiti, but its features remain unchanged as you can see in the feature comparison above.

AMD Radeon HD 7770 GHz Edition

The card you see here is the Radeon HD 7770 GHz Edition. The Radeon HD 7770 is outfitted with a Cape Verde GPU with all of its functional units intact and enabled. As the full name of this card suggests, the Radeon HD 7770 GHz Edition’s GPU is clocked at a cool 1GHz—a first for a reference GPU from AMD. With a 1GHz Cape Verde GPU paired to 1GB of GDDR5 memory clocked at 1.25GHz (4.5Gbps data rate), the Radeon HD 7770 offers up 1.28 TFLOPS of compute performance, with a texture fillrate of 40GT/s, a pixel fillrate of 16 GP/s, and peak memory bandwidth of 72GB/s.

The card is outfitted with a dual-slot cooler, but a relatively short 8.25” PCB. With only an 80W TDP, the Radeon HD 7770 requires only a single 6-pin PCI Express power feed, and its outputs consist of a single HDMI output, two mini-DisplayPort 1.2 outputs, and one Dual-Link DVI output.

AMD Radeon HD 7750

The Radeon HD 7750 has the same output configuration as the Radeon HD 7770, but its Cape Verde GPU is pared down somewhat. The GPU at the heart of the Radeon HD 7750 has one of its compute units disabled, so “only” 512 stream processors and 32 texture units are enabled. The GPU is also clocked lower at 800MHz. The Radeon HD 7750’s differences result in 819 GFLOPS (giga vs. tera) of compute performance, with peak texture and pixel fillrates of 25.6 GT/s and 12.8 GP/s, respectively. The card’s memory, however, is clocked at the very same 1.25GHz as the Radeon HD 7770, so memory bandwidth remains unchanged.

With its pared-down, lower clocked, GPU, the Radeon HD 7750 requires less power than the Radeon HD 7770—55w vs. 80w. As such, the Radeon HD 7750 does not require and additional power feeds. The standard 75 Watt power budget provided by a PEG slot is more than enough. The Radeon HD 7750 also has a much shorter 7” PCB and a single-slot cooler design.

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I'm disappointed. The streaming processors were 800 on the 5770 and 6770, total bandwidth was higher, and this card has less TFLOPS along with some other cut-down features. I am presuming that AMD is banking on the idea that people will OC higher along with driver improvements to meet or exceed the 6850/70 and the 560's. I really don't see why they trimmed the SPU's down to 640. It seems senseless to me. I don't know who they're trying to fool here but a quick comparison of the 6770 shows that it is almost just as good if not better in some instances, at least on paper.

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I believe that the 7790 will be their competitor for the 560.

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I really am seeing some very stupid posts about this card.

I run an I7 2700k at 4.6GH on an Asus p8z77 motherboard16gig gskill 2133 ram with a GTX560 Ti.

I have jusr replaced the GTX560Ti with the 7770 and see no difference in performance ,reason is I dont game, I photoshop .

The GTX560 Ti had to display ports for my Samsung 120HZ monitor which requires a DisPlayPort graphics card.

Next ...think about the price points....560Ti....$269.00..............560........$220.00...........550TI .............170.00....7770........$155.00

The 770 beats the crap out of the 550 so whats the problem ?

The 560ti is in another class and the 7770 is not meant to compete against the 560 cards.

Also stop bleating about buying a 6 series card like the 6850 6790or 6770 etc etc ..............if your been paying attention.....they are no longer sold,.......all the sites that have to order cannot fill orders from manufacturers...the stores with stock on hand are the only ones with these cards, but as most online stores run on a JIT system you wont find stock so get over it and move.

This is a great card for the money and its saving me plenty on my ever rising power bils.

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Also I should mention that the card shown in this review is the version one Asus not the version two which does away with the mini display ports (why do they keep putting these in, you need a converter for displayport monitors) and comes with a full display port.

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Since I posted earlier, one of my kids sent me a brand new 1GB XFX Radeon HD R7770 that they had won in a contest and couldn't use.

I kept it on a shelf for a month or so and then decided to buy another one, just like it,........for $150.00 shipped.

Now I have both of them installed together in Crossfire in an AMD A8-3850 APU system. The performance of one card was acceptable, but two together are quite nice. Below is a Heaven Bench result. Keep in mind that the A8-3850 is not the fastest CPU out there, or even close to it. My games play quite well with these two cards in the PC though.

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nice budget GPU though.

and it won't disappoint either.

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