CM2X1024-6400C4 on a Asus P5RC-LA

[imagoomba]

I bought 2x1GB modules, but I found out my mb only accepts 400/533 MHZ DDR2 memory. How do I underclock the ram? How do I even find out if my board can do it?

 

I have an HP Pavilion a1217n with an Asus P5RC-LA motherboard with one 512mb module and I want to add 2 CM2X1024-6400C4 modules. TIA

[RAM GUY]

I am sorry but that system will not support these modules. Please look up your system on our memory configurator and only use a module that was suggested for that system.

[RJLeong65]

I bought 2x1GB modules, but I found out my mb only accepts 400/533 MHZ DDR2 memory. How do I underclock the ram? How do I even find out if my board can do it?

 

I have an HP Pavilion a1217n with an Asus P5RC-LA motherboard with one 512mb module and I want to add 2 CM2X1024-6400C4 modules. TIA

 

Here is the reason why I agree with the RAM GUY:

 

All of Corsair's 6400C4 series memory modules and kits require a DIMM voltage of 2.1V just to run reliably at any speed and timings. Unfortunately, OEM systems like yours have no way at all whatsoever to manually adjust voltages, timings or memory speeds. And the timings are permanently fixed at the JEDEC-standard timings for their supported memory speeds (in your case, you'll have to find DDR2 memory modules which run at CAS 4 or CAS 5 latency timings @ DDR2-533 speed), while the DIMM voltage is permanently fixed at or slightly below the JEDEC reference value of 1.8V. Also, in this case, you might as well rule out all of the other DDR2-800 memory modules, since even the C5 version uses CAS 3 latency timings @ DDR2-533; the only DDR2-800 memory modules which might work on your system are those whose rated timings are an extremely loose 6-6-6-18 (which Corsair and most other major brands don't make). Using any memory with lower (tighter) latency timings programmed into the SPD than is supported by your system may result in your system failing to even POST.