Prime failiing on core #1 then core #0

corkyo4 · 20 Jan 2010 at 20:00

Have been running prime to test the stability of my system now its overclocked, but i keep getting an error on core #1 then on core #0 within the space of a minute or so.

Mobo - Asus P5QC
Memory - Corsair XMS2 DDR 2 1066Mhz 4GHz 7-7-7-20 2.0 volts
CPU - Intel E8500 3.16 @ 4.00GHz (9.5 * 424)

Memory timings are inputted manually, and DRAM Frequency is running at something like 1060MHz (the max before exceeding the limit set by the FSB i cant remember the exact value)

NB Voltage - 1.44
SB Voltage - 1.20
VCore Voltage - 1.30
Memory Voltage - 2.00

Have tried increasing the vcore to 1.33 and the NB to 1.5 and SB to 1.30 but the situation is the same.

Current temperatures for cores #0 and #1 are 40 degrees unloaded but have been upto 56 degrees loaded

Any Thoughts??

Thanks

Tom

corkyo4 · 20 Jan 2010 at 20:18

twist3d0n3 said:
you need more vcore mate, no point upping the nb to 1.5, it simply doesn't need that voltage. drop the nb down to 1.35, run the memory at the rating it states in cpu-z, and stick some more volts through the cpu ~1.4 should be your max

When you say run the memory at the rating in cpu-z, which rating do you mean?

corkyo4 · 20 Jan 2010 at 20:34

made those changes, i have dropped my dram freqency down to 863MHz (i think it was that) and that seems to have sorted it, along with the voltage changes.

Ill have to try the memory on increased speeds to see if it is that or not.

corkyo4 · 20 Jan 2010 at 20:44

paradisiac said:
i had the same issue on my Q8300 setup with my 1066 ddr2 ram.
on my biostar mobo i could lock it down at 800mhz and i could get really good oc's, but when i 'upgraded' to the p5q-e mobo it wouldnt let me fix the ram to 800mhz it adjusted it according to the cpu fsb so i could never get a stable overclock.

Yeah to be honest im wondering if it is my memory as i think i essentially solved this a while back but was greedy and wanted to use the ram to its full potential.

However CPU-Z implies the ram is pc-6400 which would give an 800MHz limit however on my invoice, the memory module itself and the corsair website it states pc-8500 which gives 1066MHz.

The fact that i cant get over the 800MHz threshold would suggest my memory is not what it seems, but as im not throughly clued up on such matters i wouldnt really know the true answer.

It is a bit frustrating though!!!

corkyo4 · 20 Jan 2010 at 20:51

ok thanks ill have a play about and see how i get on

corkyo4 · 20 Jan 2010 at 20:59

i was gonna upload a picture of my cpu-z read out for my memory but i cant attach an image.

ohwell, ill just have to have a play around with it.

corkyo4 · 21 Jan 2010 at 07:59

thanks for the info,

i do have a slightly different question though.

my mobo can take DDR2 or DDR3 memory, so if i upgrade to DDR3 i would need some PC-10666 (1333MHz),

my multiplier is 9.5 and FSB is 424.

according to my calcs the DDR3 would only work with a max FSB of 333MHz, whereas my existing memory (DDR2) can go upto 531MHz, so in trying to get faster memory i would actually be reducing the overclocking potential of my machine, am i right???

i would like to upgrade to ddr3 but if this is the case it makes sense to stick with the DDR2.

Can anyone advise.