Put my q6600 on water today

Hey guys I put my q6600 under water today and now I'm trying to dial it in. Whats the highest a 65nm c2q chip can take? My cooling set up is as follows

-GTZ SE
-XSPC X20 750 Res Pump
-Swiftech 220 Rad with 2 San Ace 109R1212H1011's with grills pulling and 2 Delta AFB1212SH's pushing.

Right now I'm at 3.744 ghz @ 72c on the hottest core in prime95

That's already fairly toasty, i'm not sure i'd go much hotter.
They're officially rated to 1.5v, on water i might do 1.6 or maybe 1.7 if the temps were good and i could afford another chip if the one i had popped.

Well I thought 80c was the do not pass limit on 65nm chips, also on air @ 3.4 I was in at 71c in the wintertime... Its warm weather here in FL now and temps are already hot! lol Anywho I'm experiencing something new here on water as 2 of the 4 cores are 10c cooler then the other two. I have 2 @ 72c and the other 2 @ 62c this is in a 27c ambient temp.

Most of the time there are a few deg difference between cores but @ 10c I would remount your WB.

I ran a 65nm chip @ 1.65v for 2+ years and the chip is still going . As long as you can Handle the heat i would be fine with 1.65v.

Ok well I will remount it tomorrow after work and see where that takes me... I would really to get 3.8ghz stable is my goal and 4.0ghz is my dream haha I wont hold my breath on that one tho

Benitora said:

Well I thought 80c was the do not pass limit on 65nm chips, also on air @ 3.4 I was in at 71c in the wintertime... Its warm weather here in FL now and temps are already hot! lol Anywho I'm experiencing something new here on water as 2 of the 4 cores are 10c cooler then the other two. I have 2 @ 72c and the other 2 @ 62c this is in a 27c ambient temp.

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This statement actually tells me there are a few possibilities here. One of them is that you are possibly loading 2 cores more than the other 2. Another is that you have an uneven block mount, which can be fixed by remounting the block. It could also be a stuck temp diode, but that doesn't sound too likely, since the closer to TJMax they are, the more accurate they are. I would let the chip idle down, wait a few minutes for the water temp to equalize, and see if you still have that much variation on your cores. At full load 24/7, I never have a temp difference of more than 4C between the cores on my Q66. Also, with my water loop, if my CPU gets over 60C, I idle down the rig. Something sounds seriously wrong, and I think it has something to do with the water block mount.

Yeah I shut the rig down and will work on it more tomorrow with remounting the wb... and go from there.

Ok so I remounted my wb today and boy did it make a huge difference in temps.... Now my highest temp is 61c with a 3 degree difference in my cores. A BIG improvment from yesterday..... Now time to finish my journey

Benitora said:

Ok so I remounted my wb today and boy did it make a huge difference in temps.... Now my highest temp is 61c with a 3 degree difference in my cores. A BIG improvment from yesterday..... Now time to finish my journey

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how did you go about re-mounting? i have around a 10c diff aswell. i tightened the block down like i would torqing down an engine head, nice and even but i still get a big diff in temps ...

I just cleaned the block and cpu off and re-applied thermal paste and then tightened it criss cross from each with the same range in motion on each screw until it was tight.

Benitora said:

I just cleaned the block and cpu off and re-applied thermal paste and then tightened it criss cross from each with the same range in motion on each screw until it was tight.

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that's basically what i have done, three times now and it hasn't made a lick of difference.

hmm idk man maybe some of these other guys can give their .02 as this is my first water cooled rig and I have my q6600 stable with 3703 @ 1.56 vcore with my highest core hitting 61c in prime95....... trying to get 3.8 but its taking ALOT more vcore to get it there and I'm not sure if I want to push it anymore.