Problems

After the first kit only reached a Prime 95 v25.5 ‘Blend’ stable speed of 1124 MHz, I spoke to members of Kingston’s R&D department on a couple of occasions in order to try and extract the 1200 MHz rated speed from the kit. Unfortunately, they have been unable to help me do this, despite the assurance that the kit has been tested on an Asus P5K of their own and passed their tests. They have been unable to advise me of the specific BIOS version they used for their testing and have also not been able to supply me with the exact BIOS configuration that they used despite my requests for this. Believing the first kit to be faulty, Kingston sent another. The second kit unfortunately performed marginally better at 1128 Mhz.

Subsequent conversations ensued which included using a dual core instead of a quad core CPU, different ratios, and using different slots on the P5K. Nothing that I’ve tried or that has been suggested to me by Kingston has helped. After the second kit also failed to hit 1200 MHz, I put my Team Xtreem PC2-6400C3 memory modules with Micron D9GMH chips back in and was easily able to hit 1200 MHz at 5-5-5-15 timings and at 2.35v - link. This should put your minds at rest that neither I nor the motherboard were at fault for the HyperX kits’ inability to hit 1200 MHz.

If you're interested in the screenshot results for all the testing that was carried out, this can be found in the following folder.