Cannot run RAM at 1066Mhz

[deadcells]

Hi Guys,

I just bought myself some new RAM for my rig. The specs are as follows:

Asus P5KC
Q6600 (running at 3.0GHz)
8800GTX

I was using 2 GB corsair 800MHz up to now with no problems. However a friend ordered 4GB 1066MHz corsair without realizing that his board does not support it. So since mine does... i decided to give him my RAM and take his even though i know there will be very little performance difference. Anyway... the problem is that once i set the BIOS to run the RAM at 1066MHz the computer will not boot. At 1000MHz it will boot but freezes whenever i try to do anything. It only seems to be stable at 800MHz.

I have manually set the timings to 5-5-5-15 and set voltage to 2.2V as well as trying to let it auto select timings and voltage but nothing seems to work.

The only thing i can think of is that the FSB is running at 333 and so it may be conflicting somehow.

While i think that there is currently no advantage to having my RAM run at 1066MHz ... i would still like to be able to since the board was advertised to support it.

Any help will be much appreciated.

 

[doomturkey]

Hmmm, most DDR2 1066 is really just DDR2 800 that is rated by the manufacturer as being able to run at 1066. You may have gotten a bad batch of RAM, try loosening the timings even further to cas 6, see if that allows you to get 1066. If not, maybe there are some FSB limitations.
I know that you would rather run it at 1066, but you should get slightly more performance out of your RAM if you run it at DDR2 800 4-4-4-12. Its not a big performance boost, so I wouldn't sweat it if I were you.

 

[Mondoman]

If 2.2V is the spec voltage for that particular RAM model, then it sounds like you've got some defective RAM and need to RMA it for warranty replacement. Unfortunately, this is very common these days among DDR2 RAM spec'd faster than DDR2-800.

 

[dragonsprayer]

it supports it you have to mess with the ratios

you need to adjust the fsb and ratio to the cpu

q6600 runs 1066 at mutlipier of 8 and higher fsb or 425-430
so you get 3.6ghz

i have never set one up like this - i ship all intel systems at 3.6ghz and most nvidia at 3.4-3.5ghz

for 400fsb 9 multiper = 3.6ghz

so 8 x 425 = 3.4ghz

the ddr800 is faster and the lower latencies are better then the higher fsb for some apps

you need 2.12-2.14v for memory with 2x 4gb sticks

you need 1.48v for cpu or little lower with the dampener locked

 

[deadcells]

thanx dragonsprayer...

will give it a bash when i get some time.

 

[flyin15sec]

Here was a review at newegg for a P5KC mobo. Maybe this might help.

Cons: Its a Asus so its a home run or miserable failure on a per board basis. PC2-8500/DDR2 1066 is not directly supported in broad range.
Other Thoughts: Have to disable ""Transaction Booster"" in Bios to make board run memory at native 1067 which in turn lowers overclocking ability and stability overall when overclocking memory. Best board for those who don't upgrade motherboard for a while.