Corsair Dominator TWIN2X2048-10000C5DF
Besides Dominator TWIN2X2048-9136C5D, Corsair is also offering even faster memory modules designed to run at 1250MHz frequency. They also belong to the Dominator family and are called Corsair Dominator TWIN2X2048-10000C5DF. I would like to stress that it is the today’s fastest mass DDR2 SDRAM for overclockers.
The design of Corsair Dominator TWIN2X2048-10000C5DF memory modules is identical to any other solution from the Dominator family. They are designed with DHX technology and are equipped with top-of-the-line comb-shaped heat-spreaders typical of the entire line-up – four per module. However, the fastest Dominator memory modules come with a more advanced accessories bundle: the two identical CM2X1024-10000C5D modules are accompanied with a specially designed Dominator Airflow Fan.
This cooler is fastened to the DIMM slot clips and directs airflow to the memory modules installed in them preventing them from overheating. From the design standpoint, Dominator Airflow Fan consists of three 40-mm fans with a little over 5,000rpm rotation speed installed into a single frame. All three fans blow the air directly to the memory modules, which generates a pretty impressive airflow in the corresponding area. Unfortunately, despite the indisputable efficiency of this cooling solution, it turns out quite noisy, which slightly spoils the overall impression.
Corsair Dominator TWIN2X2048-10000C5DF memory modules most likely require an additional cooler because of significant increase in the operational voltage in nominal mode. Dominator TWIN2X2048-10000C5DF memory modules owe their ability to run at 1250MHz frequency and 5-5-5-18 timings (at 2T Command Rate) to the increased voltage that by default is set at 2.4V.
Although the manufacturer has legalized this high memory voltage in the official specifications, I dare express some concerns regarding the safety of the modules at such voltage. Nvidia is also talking about possible outcomes of such extreme working conditions. According to Nvidia engineers, long-term operation of DDR2 SDRAM at such high voltage may ruin semiconductor chips structure and thus put the memory modules out of service. The only consolation in this case is the fact that Corsair provides lifetime warranty on all their memory modules.
Before shipping them to the stores, Corsair tests all Dominator TWIN2X2048-10000C5DF memory kits in nominal mode on eVGA 122-CK-NF67-A1 mainboards. So, they can actually guarantee proper compatibility only with nForce 680i SLI based mainboards designed by Nvidia.
The stickers you can see on each of the memory modules from the Corsair DDR2-1250 SDRAM kit contain typical info: part number, frequency, timings and capacity.
The SPD of these memory modules reports traditional info to ensure that they will work in any mainboard with default settings. As for the actual parameter values, they are located in the corresponding EPP profile. Everything meets the spec here (Everest 4.00.976 utility is again 50MHz off), so if you activate the EPP technology in the BIOS Setup, the memory subsystem will get configured automatically.
I would like to point out that the difference in default working frequencies between Corsair Dominator TWIN2X2048-10000C5DF and Corsair Dominator TWIN2X2048-9136C5D can be explained not only by higher voltage. These modules use slightly different electronic components. Faster Dominator uses modified Micron chips with lower access time - D9GMH (B6-25E). This is exactly why Corsair Dominator TWIN2X2048-9136C5D modules cannot be turned into higher-performing and more expensive Dominator TWIN2X2048-10000C5DF by just raising the voltage and adding active cooling solution.