q6600 overclocking fail

[hakimbenhamzaps4]

Hello guys, whenever i try to overclock my cpu (q6600) to 3ghz the system fails and the blue screen appears. i put the fbs to 333 and nothing changes. The oc limit is 2.7ghz, anything above that fails.

My specs :

cpu:q6600
gpu:gt 340 (upgrading soon)
mobo: p5kpl/epu
Power supply: 500w
memory: 4 gb ddr2

any advice will help me a lot, thanks

 

[william p]

There were 2 different Q6600. SL9UM, and SLACR. The first is a B3 stepping and needs nore Voltage than the later G0 stepping CPU. Check that first. The SLACR usually goes 3GHz on stock Voltage. If you add Voltage either one should go that speed. Q6700 are all G0 and with Voltage should go 3.33GHz @333fsb. Xeon X5470 can be had cheap and 3.33GHz is the base spped for those. Delidded.com has info on the Xeon swap and MB compatability.

 

[hakimbenhamzaps4]

There were 2 different Q6600. SL9UM, and SLACR. The first is a B3 stepping and needs nore Voltage than the later G0 stepping CPU. Check that first. The SLACR usually goes 3GHz on stock Voltage. If you add Voltage either one should go that speed. Q6700 are all G0 and with Voltage should go 3.33GHz @333fsb. Xeon X5470 can be had cheap and 3.33GHz is the base spped for those. Delidded.com has info on the Xeon swap and MB compatability.

i see, how do i check which model of q6600 cpu i have ?? (sl9um or slacr)

ps: i edit the cpu voltage to 1.30v, do i have to increase it a bit more or i'll burn the cpu ?

thanks

 

[william p]

The S code is etched into the CPU along with the Q6600 markings. CPUZ can list stepping info. also.
It says here up to 1.5V. is allowed.
http://www.cpu-world.com/CPUs/Core_2/Intel-Core%202%20Quad%20Q6600%20HH80562PH0568M%20(BX80562Q6600).html
Of course more volts= more heat. But you are nowhere near the limits for an old 65NM Quad. Also notice the G0 can go 9*C, higher than the B3. It's like an entirely different CPU. 65NM means it has larger "wiring" inside the CPU than later 45nm chips. If you have the cooling a G0 can handle massive overvolting. The Q6600 G0 got a huge rep. from overclockers back in the day because ti cost 1/2 of what the premium Q6700 cost. Now that isn't true anymore, and a Q6600 G0 can cost more than the identical Q6700. The Q6800 SLACP ($1000 CPU back when) is unlocked Multi G0 with base clock 2.93GHz. Use the S code to shop for CPUs. The Q6600 trick used to save $100s but IMHO now it's just a relic.

 

[hakimbenhamzaps4]

i was trying so hard to oc yesterday , but no results. when i oc to 2.88ghz (20%) it works, but 3 min inside the stress test the pc crashes.

 

[william p]

These are all old MB by now. Look at the capacitors for leaking, bulging or staining in the grooves on the top. These are all signs of failure. A B3 chip should go 3.2-3.3GHz easy, the G0 should go at least 3.45Ghz. On a good MB quite a bit more. Are you monitoring temperature? When you increase clock speed that increases temp. When you increase voltage also it becomes exponential. 1.2 clock X 1.2 Voltage =1.44 heat. So cooling is mandatory for this. Something isn't right you're not even getting base clock for a QX6800. At 2.88 cooling shouldn't be an issue.
Get Throttlestop 6.00. It has a temperature and speed readout with a light stress test built in. HW Monitor is another. A G0 will usually go 3.0GHz on stock Voltage by pinmod to 333fsb. That's one reason they were so popular. A piece of tape and you just saved $700!

 

[hakimbenhamzaps4]

i just noticed i have the G0, but i cant overclock. the temperature right now of the cpu is around 32C (2,8ghz oc), if i try to overclock it a bit more the system refuses to turn on and the OS says that something went wrong with the oc. I will try the tape trick and i will see what happens. Thanks for answering tho : D

 

[hakimbenhamzaps4]

I overclocked it ! After several times trying to overclock the CPU i figured out that the problem was that the voltage was at Auto or "Safe mode"

thanks for trying to help me