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post #1 of 12 (permalink) Old 08-24-2019, 08:34 AM - Thread Starter
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Q6600 underclock/undervoltage

I am using a Q6600 at the moment. But I only have the smaller intel heatsink that was intended for a pentium dual core E5400.

The temps were pretty high at 2.4ghz, so I changed the multiplier to "6" instead of "9" in the bios, so it only runs at 1.6ghz. But the voltage seemed to be 1.15v.

What do you think the lowest voltage I can get away with is, if I'm only going to run the CPU at 1.6ghz? It says on the intel site that 0.85v-1.5 is the voltage range for this. Does that mean the CPU can be run at 0.85v, if you are only using 1.6ghz?

I lowered the voltage to only 1.00v and it seems to be stable so far with prime95 running, and the temps never get above 55c

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post #2 of 12 (permalink) Old 08-25-2019, 05:42 AM - Thread Starter
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anybody? Why is this forum so quiet nowadays anyway? It looks almost completely dead...

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post #3 of 12 (permalink) Old 08-25-2019, 06:09 AM
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Probably more to do with you playing with a 10 year old quad core processor that no one remembers anything about these days

Generally speaking when undervolting you need to test two things ... stability under load and, if your using a negative offset, stability at idle. (undervolting can sometimes result in a system that is stable under load but produces errors at no-load)
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post #4 of 12 (permalink) Old 08-25-2019, 07:18 AM - Thread Starter
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Quote: Originally Posted by clannagh View Post
Generally speaking when undervolting you need to test two things ... stability under load and, if your using a negative offset, stability at idle. (undervolting can sometimes result in a system that is stable under load but produces errors at no-load)
It's running at a fixed frequency, fixed voltage.

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post #5 of 12 (permalink) Old 08-25-2019, 08:37 AM
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Quote: Originally Posted by clannagh View Post
Probably more to do with you playing with a 10 year old quad core processor that no one remembers anything about these days

probably more that the people here aren't interested in guessing what voltages OP's CPU needs to run at arbitrarily determined clock speeds when the OP can find that out himself fairly easily.

if you can lower voltage, lower the voltage. if you can't, then don't.

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post #6 of 12 (permalink) Old 08-25-2019, 09:45 AM
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Quote: Originally Posted by fenderjaguar View Post
anybody? Why is this forum so quiet nowadays anyway? It looks almost completely dead...
lol People would rather post in "the million post thread" or "post your last purchase" and "Ban user above user for a reason" haha

But I had to find the thread I made back in the day.
https://www.overclock.net/forum/5-in...table-o-o.html

I had a C2Q 65nm G0 revision
I cant remember my temps but i was able to get 8x multi 3.2GHz @ 1.144vcore with a good cooler
I would start with where you are @ 1.0vcore and start upping the frequency till you hit your temp limit or the vcore is not enough and/or becomes unstable
Maybe start at 1.0vcore 300FSB and 7x multi, that will give 2.1GHz, I would expect that to run.

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post #7 of 12 (permalink) Old 08-25-2019, 11:02 AM
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Pretty much what Pook said.
Lower the voltage until it doesn't pass prime (or preferably IBT on very high at least) and then start raising multi and vcore until temps are around 70-75c under full load. 55c give you plenty of headroom and it would be a shame to lose performance for nothing.
Stress test it with 25 runs of IBT and if it passes, you're pretty much good.

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post #8 of 12 (permalink) Old 08-25-2019, 01:41 PM
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It is a good procesor bro

Trimis de pe al meu SM-A202F folosind Tapatalk
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post #9 of 12 (permalink) Old 08-25-2019, 01:55 PM
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Can't spend $10 on a better heatsink?

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post #10 of 12 (permalink) Old 08-25-2019, 02:29 PM
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I did this with a QX6700 because I couldn't bring myself to throw it away or sell it and stuck it in a media center that is still in use today!

I don't remember the voltage I ended up with but just keep lowering it until its no longer stable and then bump it up a couple notches. Nothing you do here will damage the CPU. Anything lower than stock voltage is "safe" just a question of weather it is stable or not.
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