Please help with Q6600 Throttling

parxuk · 21 May 2008 at 20:07

Further to a recent thread of mine about Q6600 VIDs and not being able to get my Q6600 with a VID of 1.325 above 3.4ghz, i today replaced it with one with a VID of 1.285.

I had been running the previous Q6600 at 425 x 8 giving me the 3.4. On swapping the processor i upped it to 450 x 8 and it boots no problem at all (the other Q6600 wouldnt even POST at this), and gives me the magical 3.6 i have been after.

However, after a couple of minutes of using CPU stability tester, which maxes all 4 cores, the cpu throttles back to 2.7ghz (450 x 6).

This is not good. The multiplier is set to 8x manual, so there is no speedstep option in the BIOS. It must be something else. Temps are arround 55c under load. VCORE is 1.45, i have done the pencil mod, and this shows as 1.440 even under load in CPU-Z.

Please can anybody tell me why this is happening, and can i stop it???

Q6600 (watercooled)
Asus P5KC
Thermaltake VE2000
4 x Corsair XMS2 1GB 6400 (running at 900mhz) 5-5-5-12 2.10v
Nvidia 9800GTX

Space Monkey · 21 May 2008 at 22:12

Have you got C1E and EIST in the bios, if you have disable them?

parxuk · 22 May 2008 at 08:32

I Upped the VCORE from 1.450 to 1.475 and now it doesnt throttle. Runs 4c higher though at 59c. This shouldnt be a problem though should it???

Cob · 22 May 2008 at 09:50

59c under load is fine. You can easily go to 70c with the quads.

Pneumonic · 22 May 2008 at 09:52

the bios does have a speed step option, is not in the jumper config cant check right now at work but it does have one

parxuk · 22 May 2008 at 12:19

OK, thanks guys

Bearing in mind i am already at 1.475 for 3.6, am i likely to get much more from this, or should i be happy with 3.6 (well i am happy, but always want more)

Pneumonic · 22 May 2008 at 12:22

well as long as your load temps are under 70c you can keep upping the vcore, limit is really up to you I would go not higher than 1.6 but some people arent comfortable over 1.5...

Greebo · 22 May 2008 at 12:30

For day to day running I would leave it at 3.6. If you want to go for a highend stable benchmark, you will need more volts.

I had to put 1.55v through mine to get it stable at 3.8Ghz (VID 1.25v) but I have serious vdrop and vdroop so it was only 1.46v under load in prime95. Plus I can't get mine stable with the 9 multi past 3.2Ghz and I feel I am reaching the limit of the fsb at 475 rather than the max of my chip at 3.8Ghz

However, the day to day temps and voltage at 3.8Ghz, I am not happy with so I have now settled on 3.5Ghz for day to day usage. More than enough uummph with 4 cores running at 3.5Ghz

Still going to try for a stable 4Ghz benchmark run at the weekend though.