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Q6600 Voltage Settings...Running Cooler now 41 -> 29C!!

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November 26, 2007 2:10:21 PM

Hello again,

I recently have been fiddling (safely of course) with my voltages. Here is what I have:
Q6600 B3 w/ stock cooling, 1066Mhz DDR2 RAM 2GB, Asus Striker Extreme

VCORE --> 1.09375 V
MEM ----> 2.075 V
NBCORE -> 1.25 V

*EDIT: I'm running at stock speed (2.4Ghz) and do not over clock for right now as I have no need to at this point. I might in the s future however.

All seems to be running well. Did some Prime 95 testing, left the computer on overnight, no problems so far.

The CPU actually runs a lot cooler from when I had the voltage on AUTO (which was 1.28V for Vcore). It use to run 41 C but now idles around 29 C! I'm getting these temps from Everest. Thats a huge difference just by changing some voltage.

Just wanted to let some of you know out there.

Also, do you guys see anything wrong here or dangerous?

Thx in advance.
November 26, 2007 2:18:06 PM

If you can undervolt the CPU and be stable at stock settings there isn't an issue.
November 26, 2007 5:54:53 PM

The specifications on Intel's page list the volt rating for the Q6600 B3 to be between 0.85 - 1.5V. I would be undervolting if I set my Vcore below 0.85, isn't this true?
November 26, 2007 6:03:04 PM

Actually, because of speed step, the .85 - 1.5v is its range. Its stock voltage is 1.325v, and shouldn't go above that. When it's lower the 1.325v, that just how it conserves power and reduces heat.

Not sure if you can actually disable it, and run it specifically lower manually. I know I can't under volt my system.
November 26, 2007 7:12:27 PM

Id be interested to hear some more thoughts on this as i have a Q6600 that i run at stock (B3) and i would also love it to run a little cooler. Anybody else got any thoughts theories or trials on this?
November 26, 2007 8:39:47 PM

Chookman, I have a B3 Q6600 also and it has been stable for at least a day or two now...I applied random tests...Everest, Prime 95, some gaming...and I haven't seen any BSODs or abnormal behavior.

I might try an even lower voltage soon.
a c 127 à CPUs
November 26, 2007 8:59:09 PM

Depending on your BIOS you can disable speedstep and then manually underclock the voltage. I have read that having speedstep enabled and setting the voltage manually tends to cause instability or non booting. I did and it wouldn't go into Windows so I leave it at auto since it stays at 1.121v normally at 2.7GHz.
November 26, 2007 9:07:38 PM

You know, it could be the colder weather these days that's lowering your temps significantly.
November 26, 2007 9:10:47 PM

Well of course undervolting your CPU will result in lower temperatures... Some chips need a higher voltage than others. Just try to lower your cpu voltage by increments and running stress tests in between to make sure it's stable to get it to the lowest possible stable voltage.

Lol Evilonigiri, you and ambient temperatures, you just get along so well :p 

Erhm says: Oh i lost my virginity today! What a miracle!
Evilonigiri says: this was caused by the ambient temperature changing...
a c 140 à CPUs
November 26, 2007 9:20:40 PM

Good work. As long as its prime stable(at least 12 hours), you are gonna save heat and power....

1.09 seems amazing, i can only guess on the OC potential of that chip....
November 26, 2007 9:25:32 PM

Yeah, very strange for a B3 chip. I would try to see how that chip overclocks!
a b à CPUs
November 26, 2007 10:09:29 PM

Sounds about right.
My B3 is running @ 2.7Ghz with 1.15v (bios)
Runs ~1.12 idle to 1.09 load
November 26, 2007 10:17:12 PM

radium02 said:
Hello again,

I recently have been fiddling (safely of course) with my voltages. Here is what I have:
Q6600 B3 w/ stock cooling, 1066Mhz DDR2 RAM 2GB, Asus Striker Extreme

VCORE --> 1.09375 V
MEM ----> 2.075 V
NBCORE -> 1.25 V

*EDIT: I'm running at stock speed (2.4Ghz) and do not over clock for right now as I have no need to at this point. I might in the s future however.

All seems to be running well. Did some Prime 95 testing, left the computer on overnight, no problems so far.

The CPU actually runs a lot cooler from when I had the voltage on AUTO (which was 1.28V for Vcore). It use to run 41 C but now idles around 29 C! I'm getting these temps from Everest. Thats a huge difference just by changing some voltage.

Just wanted to let some of you know out there.

Also, do you guys see anything wrong here or dangerous?

Thx in advance.


If you really want to test out your system's stability, try F@H SMP. Sometimes it will crash systems that passed Prime 95.
November 27, 2007 12:27:46 AM

Thanks guyz ill have to have a look at this myself some day and report the findings... im going to a thermalright 120mm soon which will help ;) 
May 19, 2008 1:35:12 AM

chookman, love the signature. lol 109c...

Nice undervolt. As everybody else has said before me, I could imagine how far you can take that beast.
!