EMS PC133 HSDRAM

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CAS2 vrs. CAS3 - The Test

     

 


(Our Test System)

Full Tower ATX Case w/ 300W PS, Pentium3 -450 Overclocked to 558 MHz. w/ a 124MHz.System Bus, Abit BE6 Motherboard, 128MB of Toshiba PC100 RAM and 128MB PC133 HSDRAM from EMS, IBM Deskstar 10GXP 10GB 7200 RPM EIDE UDMA Hard Drive, 3dfx Voodoo3-3500TV AGP Card w/ 16MB, Toshiba SDM1202 3rd. Gen. 4.8X DVD/32X CDROM, Win 98, DirectX 6.1


     

SiSoft Sandra "STREAM" Memory Benchmark

For this test we did not have a CPU in house that was capable of a 133MHz. Front Side Bus Speeds. Instead, we used a Pentium 3-450 that was capable of 124 MHz. with the utmost stability. In this test, the Toshiba PC100 module was not stable at the 124 MHz. bus speed at a CAS Latency Setting of 2, so it was set to 3. With this setting we experienced good stability with the Toshiba module.

However the EMS Memory was rock solid stable at 124MHz.X4.5 for a total 558MHz. with a CAS2 setting. What you see below is the difference that CAS2 makes with respect to system memory speed.

Click for larger view...

 

PC100 CAS3

EMS - PC133 CAS2

As you can easily see a CAS2 setting makes a difference and the stability of the EMS DIMM was perfect at this speed. Since the module is designed to operate at 133MHz. w/ 3,2,2 settings, 124 MHz. at 2,2,2 was a walk in the park for the EMS module. The Toshiba DIMM fell down badly even vrs. the Sandra base system. I can only assume the base system was running at 100 MHz. FSB and was set to CAS2. With this in mind it is easy to see how lower quality SDRAM can hurt your overclocked performance. Due to the fact that the standard SDRAM DIMM could only run at CAS3 with the 124MHz. FSB setting, we were forced to throttle back memory bandwidth significantly. This doesn't mean our P3-450 @ 558MHz. was slower overall than the base Sandra System, a P2 @ 450. The CPU speed boost plays heavily as well, of course. However, the system with a stable CAS2 setting at 124MHz. system bus enjoys the best of both worlds.

 

Wintune Memory Performance Test

 

PC100 CAS3

EMS - PC133 CAS2

Once again, a measurable difference between CAS2 and 3 and a measurable difference in memory subsystem performance.

     
     

Overall Impressions (updated 8/22)

I have seen a lot of memory modules and from my perspective, the stability and performance of Enhanced Memory Systems' PC133 SDRAM Module is second to none at this point in time. Other sites have tested this product vrs. other manufacturers like Samsung, who is noted for their high quality "-G8" chips. The outcome was the same. Nothing matched the HSDRAM from EMS with respect to stability.

Having said that, real world application performance will be impacted only by a small margin as a result of this higher speed memory. The real benefit this technology brings you is stability in extreme overclocked systems of today's technology along with some additional headroom for the next generation of bus frequencies with the latest chip set and processor technologies. At this point in time, the EMS HSDRAM is ONE of the fastest modules you can buy. There are other PC133 module makers out there and we will be taking a look at their offerings as well in order to level the playing field

     

We give the EMS PC133 HSDRAM DIMM a Hot Hardware Temp-O-Meter Rating of...

  90!

-Davo

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