Corsair Twin2X1024A-5400UL

1 GB (2x 512MB) DDR2 (667) PC-5400
Corsair XTreme Series (TWIN2X1024A-5400UL)

As we have discussed in previous nForce4 Intel Edition chipset reviews, is that the memory bus can be changed independently of the CPU bus simply by entering the speed at which you wish to run the memory. This degree of flexibility can yield outstanding results when used in conjunction with CPU front side bus overclocking. It goes without saying that the combination of CPU and MEMORY bus speeds is almost limitless. Which is quite a different story on the Intel 925 and 955 chipsets because you're limited to the DRAM ratios preset in the BIOS. Due to the incredible latency settings these modules are capable of, I will be putting this dual channel kit to test on both an Intel 955X and nForce4 SLI Intel Edition Chipset. First, for the nVidia system.

CPU	Intel Pentium 4 "560" 3.6Ghz
Motherboard	Gigabye GA-8N-SLI Royal nForce4 SLI Intel Edition Chipset

Memory Voltage	Speed Mhz	Latency Timings	Sandra (ALU)	Sandra (FPU)	Science Mark 2 MemBench
2.1V	667	3-2-2-8	4822	4866	4648
2.1V	685	3-2-2-8	4862	4860	4635
2.2V	700	4-3-3-8	4865	4870	4626
2.3V	733	5-4-4-15	4812	4816	4613

Using SiSoftware Sandra and Science Mark 2.0 as the measurement guide, I targeted specific clock speeds with the intent of finding the best possible latency timings which would hold the system stable. The above chart is the result. Asynchronous CPU / Memory bus speed operation is not a strong point for the the nForce4 SLI Intel Edition chipset, and this chart above highlights that all to well. Though the memory was able to POST, boot, and run stable through benchmarks at the different bus speeds - the chipset just doesn't gain the memory bandwidth that should come from higher clock speeds. Still, nVidia does have the only viable solution for SLI video operation for the Intel Pentium 4.