Memory Speed Issue

[DanCarr]

Hi,

I bought the Asus PK5C motherboard from here in around November/early December. My CPU is the Intel Core 2 Duo E6750 (1033 fsb). For some reason since yesterday the system has been really unstable. I also purchased the following RAM:

OCZ 2GB (2x1GB) PC2-8500C5 1066MHz SLI-Ready Edition Dual Channel DDR2 (OCZ2N1066SR2GK)

Since building the pc on automatic the mobo set the ram speed to 667mhz. It began crashing as of yesterday and i narrowed this down to a voltage problem, therefore i set the voltage to 2.2v as the range is 2.1 - 2.2v with the protection on the ram set to 2.35v. The system has now become stable again, running at 887mhz ram.

However the problem i'm having is I cannot get the computer to boot with the ram set manually to 1066mhz, it simply won't do it. Am i doing something wrong? 887mhz is currently the best i can get from the RAM, which is obviously below stock speed.

Thanks in advance,

Dan

 

[Admiral Huddy]

Hi, Welcome to the Forums

I have read reviews that the Asus P5KC has problems with higher frequency RAM (i.e. above PC2-6400) due to it's DDR3 compatibility. It might be worth looking at a BIOS update to see if they have sorted out the issue.

A future BIOS revision should also address the memory glitches we suffered, as the P5KC was a terror when trying to run memory at high frequencies. We had to use the Auto setting with both DDR2 and DDR3, as trying to use the 1,066MHz of our Corsair XMS2 PC2-8500 - or even the 1,333MHz setting we tried with the Patriot PC3-15000 (1,866MHz) - made the system hang at POST. On one occasion, we had to use Vista's excellent MBR repairer, as the memory controller messed up the boot procedure. Stock tests therefore had to be conducted with the DDR2 at 800MHz and the DDR3 at 1,066MHz.

 

[Spinaker_42]

I had a very similar issue on an Asus P5B mobo with this OCZ ram:

OCZ 2GB (2x1GB) PC2-6400C4 Dual Channel Platinum Revision 2 XTC Series DDR2 (OCZ2P800R22GK)

In the same way, it was unstable, and after upping the voltage it became stable but at lower than clocked speeds on the ram. similarly, when i tried to manually adjust the ram back up to what it should be in the bios, the whole thing became unstable again.

Your not the only one that would like to know DanCarr, lol.