I have decided to overclock my 'old' (2.5 year old) computer.
I have the following
Q6600 G0 stepping (running at stock since purchased)
4xCorsair dominator 1066 RAM
Xigmatek HTD-x1283 cooler (bolt on kit) - just purchased this week
Silverstone OP1000W PSU
The first run of Prime95 with round checking on at stock speeds failed after 11 mins (I've never done round checking so it prob would have done this on the old cooler as well)
I used to have problems running 4x1Gb at 1066 on this board (even with MCH+0.1 and DDR+0.3 at 5-5-5-15) so I have been running the ram at 800 4-4-4-12 with MCH+0.1 and DDR+0.3.
Anyway, I decided to continue overclocking with just two sticks instead of four.
So far I have had minimal problems - one BSOD and two fails of Prime95.
I am upto the following:
Q6600 G0 @ 3204mhz
2x1Gb DDR800 @ 712Mhz 5-5-5-18
FSB : 356Mhz
Performance Mode: Standard
DRAM Multiplier : 2.00B
DDR Overvoltage : Normal (1.8V)
MCH Overvoltage : Normal
RAM Speed : 712Mhz
RAM Timing : 5-5-5-18
CIA2 : Disabled
C1E + EIST : Disabled
System Voltages : Manual (CPU Voltage 1.28 [one step up from 1.28750 to 1.29375])
I ran this exact same configuration EXCEPT the CPU voltage was stock at 1.28750 (registering as 1.23-1.25 in Everest 4.6) and Prime95 failed after 3 hours.
I have put the voltage up one step and Everest now says it is 1.25-1.28
The cooler temps are excellent. I know I should calibrate RealTemp but I haven't done this yet as it sounds a bit confusing.
Stock HSF 2.4Ghz under load: 52C (CPU) 52-58C (cores)
Stock HSF 2.7Ghz under load: 57C (CPU) 61-67C (cores)
Xigmatek 2.4Ghz under load: 38C (CPU) 37-46C (cores)
Xigmatek 2.7Ghz under load: 39C (CPU) 42-47C (cores)
Xigmatek 3.0Ghz under load: 40C (CPU) 44-48C (cores)
Xigmatek 3.2Ghz under load: 44C (CPU) 47-51C (cores)
Ambient temp - 16-20C (winter time here)
*** QUESTIONS ***
Does this sound plausible at 3.2Ghz to have almost stock voltage?
Could my RAM be being difficult with the B (333mhz) strapping - should I loosen it to D (400mhz) or something?
Is there any way I could get 4x1Gb sticks working do you think (even with loose timings)?
I am thinking that I will prob just go to 3.4Ghz and leave it there - what CPU voltage is sensible for this?
if your ram is set to 1T change it to 2T ( could b "n" instead of t ) and see what happens.. the core 2 i have found doesn't like 1t with 4 slots populated.. it could have been my board, but it's worth a shot
ok so you added ram, increased mch v, and dram multi. have you run memtest on the ram at stock settings to verify the ram is not bad? also have you made sure your ram is set correctly for timings and voltage?
Hiya - yeah I ram memtest for 16 hours on the first 2 sticks when I got them (2.5 years ago) and the second 2 sticks when I got those (2ish years ago) - then all 4 sticks together.
I also had this big thread on the corsair forums where we determined that despite passing memtest & being 'stable' the occasional blue screen was actually down to running 4x1gb & 1066 on a GA-X38-DQ6 without any extra juice to the MCH (even with +0.3v to the RAM)
Also despite both being PC8500 1gb dominator sticks - 2 are version 2.1 (which need 2.1v) and 2 are version 4.1 (which need 2.15v) - annoying!
Anyway - long story short I switched to MCH+0.1v and kept DDR+0.3v and changed to 800mhz@4-4-4-12 (strap 3.00A) and everything was rock solid.
But it must never have been *really* rock solid I reckon due to prime95 failing with round-checking on at stock settings with the new cooler
I have just finished 10h of prime95 blend testing with 4x1Gb @712Mhz (Strap 2.00D) and I am going to try 854Mhz (Strap 2.40D) and up the juice on the ram from stock (1.8V) to +0.3v (2.1v) but keep the timings at 5-5-5-18 and hope that that works as a next step!
that is a big jump for the ram,,, i wish you luck and keep us posted.you may get up to 900 if th ram is good and the memory controller can handle it. remember whene populating 4 slots, you are stressing the controller as well as the ram