In our tests, we used our AM2 4000+ and ran it on ASUS M2N32-SLI mainboard. We used the old pair of Corsair DDR2-533 rated at CAS 3,1T and ran it at DDR2-800 CAS 5, 5-5-15 2T. This is done at 2.2v. The pair is a 2x512MB.

On the other hand, we have our new and shiny DDR2-800 CAS 5-5-5-15,2T modules from Corsair. It is a 2x1GB pair.

1GB pair : Corsair CM2x512-4300C3

2GB pair : Corsair CM2X1024-8500C5

We first compared the results when both pair of modules were tested on the same ASUS M2N32-SLI mainboard set to the same ram timings.

Both gave very close results of within 0.5%. The only difference we found is that the memory benchmarks from Sandra 07 shows that the 1GB pair scored 7525/7524 in comparison with the 512M pair at 7141/7116.

This proved one point, most of the better CAS 3 DDR2-533 module should be able to do CAS 5, DDR2-800 with vdimm set to 2.2v.

We were quite hopeful and wanted to decrease the CAS latency to CAS 4 or 3 to see the impact of the performance. Unfortunately, it didn't POST with the 512M pair.

On the next page, we used the 1GB pair and benchmarked it at CAS 3 and CAS 5. To my surprise ....