Corsair and Asus Reach DDR2-1066

It was clear in our early testing of the Asus P5WD2 Premium that Asus was interested in showing the standout memory performance of their new 955X motherboard. Toward this end, Asus, Corsair and OCZ all worked on low-latency DDR2 memory solutions that would perform well in the P5DW2.

OCZ and Corsair both supplied low-latency DDR2-667 512MB DIMM pairs for benchmarking with the Asus P5WD2 Premium.

OCZ supplied PC2-5400 512MB EB rated at 4-2-2-8 at DDR2-667.

Click to enlarge.

Corsair supplied their CM2X512A-5400UL.

It was established quickly that both memories could do DDR2-667 at 4-2-2-4 timings on the P5WD2, so we pushed both to DDR2-800. Both ran with complete stability at DDR2-800, at the still aggressive 4-3-2-4 timings. Since neither memory pair had any problem with DDR2-667 or DDR2-800, all benchmarks were run at both memory speeds. DDR2-667 is the rated speed of 955x memory, and DDR2-800 is the next logical speed rating.

The next memory milestone is DDR2-1066, which is an exact 2:1 ratio with the 3.46EE introduced with the 925XE motherboard (Intel CPU is quad-pumped and memory is Double Data Rate). Intel's Pentium D chips are currently based on 800FSB, but the 955X does support 1066FSB. With this in mind, we mounted an Intel 3.46 Extreme Edition with a 1066 FSB.

Click to enlarge.

We were amazed to find that the Corsair CM2X512A-5400UL could reach DDR2-1066. This yielded a Sandra standard bandwidth of just over 6400 MB/sec. To put this in perspective, this is the first motherboard and memory that we have ever tested capable of running at DDR2-1066. Frankly, 1066 required slower 5-5-5-15 timings at the maximum 2.3V available on the Asus. We also needed to push all chipset and bus voltages to the maximum and set CPU voltage at 1.60V to achieve this milestone.

These compromises are reflected in the unbuffered bandwidth of about 3300 to 3400 MB/s. 1066 was the absolute maximum that we could reach and we would not call that speed 100% stable. However, none of these qualifications take away the remarkable DDR2-1066 milestone that Corsair and Asus have achieved.

The OCZ PC2-5400 took a different approach at the top of the performance curve.

Click to enlarge.

The OCZ reached DDR2-1000 on the Asus P5DW2 Premium, but at faster 5-3-2-4 timings.

This yielded slightly slower Sandra standard scores at about 6200 MB/sec.

However, the unbuffered Sandra scores were higher than Corsair at 3500 to 3600 MB/sec.

We'll leave it to the memory manufacturers to argue which is better, since performance of the Corsair and OCZ is essentially the same on the new Asus P5DW2 Premium. However, no matter how you view the results, Corsair has earned the title of fastest memory speed in this round at DDR2-1066. There is also the advantage of being able to run the 3.46EE processor at the full rated speed of 1066 FSB with the memory running at 1066.

nForce4 Intel Considerations

The Asus P5ND2-SLI also had no difficulty in reaching DDR2-800 memory performance. However, one of the marketing points made by NVIDIA is the 1T Command Rate that can be used with the nF4 Intel Edition at DDR2-667. The P5ND2-SLI does indeed handle a 1T Command Rate at DDR2-667, but by DDR2-800, a 2T Command Rate was required for stable operation. On the nF4 Intel platform, the performance impact of a 2T Command Rate appears to be rather small, as the nF4 Intel performance remains very competetive with the 955x as far as it goes. However, at just over DDR2-900, the nF4 Intel appears to hit a wall - with the same memories that do DDR2-1000 to DDR2-1066 on the 955x. As a result, we have no screen captures or results to post for the Asus P5ND2-SLI above DDR2-800.

Memory Stress Testing Test Setup


View All Comments

  • overclockingoodness - Wednesday, May 11, 2005 - link

    Can someone tell me why they decided to bench both at DDR-667 and DDR-800?

    Wesley: are you planning on testing all Intel mobos like that with two different memory speeds?
  • Capt Caveman - Wednesday, May 11, 2005 - link

    I actually plan on returning the P5WD2 Premium that I purchased. I bought this board for going to dual core but was really sold on the Wifi-TV card that was supposed to come with it. It's the first board in Asus's Ai Life Series and the major component of this series is the Wifi-TV Card.

    Well, surprise my Asus Premium doesn't come with one. It's optional. I spoke to people at Asus US in Technical Support, Customer Service, Pre-sales and RMA groups and they all confirmed to me that there was only one model and it's optional. Every retailer that carries the P5WD2 Premium has it without the Wifi-TV Card. Yet, the reviewers have them, making you think that the card comes with the board.

    Also, things have been down-graded on this board from previous premium boards. The mosfet heatsink is aluminum compared to the copper heatsinks used in my P5AD2-e Premium. Contrary to what some have said, the P5WD2 Premium does not have IDE Raid when the P5AD2-e Premium did. The P5AD2-e Premium also has 1394b where the P5WD2 Premium does not. And obviously no built on Wifi.

    Why did they call this board a Premium when it's missing all of the premium items that we're used to getting? Why didn't they just call it the Deluxe since this board does not have the premium features as it's other premium boards?

    I believe Asus is misleading folks. I have yet to receive a reply back to several emails that I have sent also.

    Sad thing is that I was a huge fan of Asus til getting this board which I must pay a 15% restocking fee to return.
  • elecrzy - Wednesday, May 11, 2005 - link

    on page 2, you might want to add that NF4 supports SATAII, not just SATAI. Reply
  • RadeonGuy - Wednesday, May 11, 2005 - link

    it would have been better to include a fx-55 as competition Reply

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