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Overclocking and Prime95 - my first major overclock - need help please

post #1 of 2
Thread Starter 
Computer I'm making:

CPU Q6600 G0 SLACR (lapped)
MB: Gigabyte GA-X48-DQ6 (unfortunately, it's so new that its hard to find info on)
cooler: TRUE (also lapped) with scythe 120mm 100+ cfm fan, on tight with 'penny' (well...dollar coin) mod
PSU: PC Power and Cooling S75Qb 750W
video: Zotac GeForce 8800GT 512 MB
ram: G.Skill 4 GB (2x2gb) DDR2 1066 (mfr. specified voltage is 2.1, with 5-5-5-15 timings, when the motherboard is set to autodetect timings, it gets 5-7-7-20, right now I have it dialed in to the recommended 5-5-5-15 timings, but running at 800 instead of 1066 for a 1:1 ratio)
fans: 5x Thermaltake A2016 80mm variable case fan

I posted earlier about a heating problem, and later figured out that the Xigmatek heat sink was not clamping hard enough onto the processor, and two pushpins refused to hold. So, I got a TRUE, and that problem's solved - no more overheating . On to the next problem!

Since the BIOS only lets me set ram timings corresponding to 2.4, 3.0 and 3.6 GHz CPU FSB speeds, I'm trying for a 3.6 overclock, which should be more than doable with this board and cooling setup - but it's not working (I'd be happy with 3.4, but the board doesn't support it, and I don't want to go as low as 3.0).

I set the stock voltage rather high, at about 1.481, (stock for the 6600 is 1.3, with Intel stated max of 1.55) and started up the computer, with the intention of slowly working my way down voltage-wise until the computer became unstable. The board posted with no problem, but I started getting errors when running Prime95 (large FFTs, 4 threads). I assumed the voltage was still too low and adjusted higher. Same story when I upped the voltage to the low 1.49s. Once I hit 1.50, however, instead of giving me an eventual rounding error, the computer just started locking up after about 2 minutes! No error message, no warnings, just a lockup. I raised the voltage again to 1.51 and the same thing happened.

At no time did the CPU core temperature go above 68C, so I doubt its overheating.

Any ideas as to what I'm doing wrong? Are my voltages too high? Too low? (Is it even safe to put a Q6600 at/above 1.5V even if it's not overheating?)

How can I tell if my voltages are too high or too low?

Anyone with a similar setup have an idea on what voltages I should try?
Any other information I should post?

Thanks for your help!
Zithras
post #2 of 2
read this: http://www.overclock.net/intel-cpus/...l-threads.html
I won`t try major overclock for my first time...go safe and slow..
    
CPUMotherboardGraphicsRAM
E5200, @3.5Ghz, 1.385 :/ Asus P5E3 Deluxe Sapphire HD 4850 Kingston 2*1gb, 1333Mhz, CL9 temp 
Hard DriveOSMonitorPower
WD Caviar Blue 6400 AAKS Win XP SP3 dual boot Vista Ultimate SP1 Samsung T220 Thermaltake Purepower RX 600w 
Case
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CPUMotherboardGraphicsRAM
E5200, @3.5Ghz, 1.385 :/ Asus P5E3 Deluxe Sapphire HD 4850 Kingston 2*1gb, 1333Mhz, CL9 temp 
Hard DriveOSMonitorPower
WD Caviar Blue 6400 AAKS Win XP SP3 dual boot Vista Ultimate SP1 Samsung T220 Thermaltake Purepower RX 600w 
Case
NZXT Tempest 
  hide details  
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