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stephentw
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by stephentw » Tue Apr 21, 2009 5:54 am
Well, I'm not really an idiot. But this undervolting stuff is mildly confusing. I've read a few threads saying people have managed to keep their CPU at stock speed (which is what I want) and undervolt to aout 1.1-1.2 does that sound like a realistic starting point?
Also should I be just changing the VCORE? Or should I start fiddling with ram and other things too?
I'm aware I should also stress test afterwards, with prime95 I think I read? How long should I look to leave this sort of thing running to determine stability?
Thanks.
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yamahaSHO
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by yamahaSHO » Tue Apr 21, 2009 6:59 am
I undervolted just the CPU voltage down to 1.032v with an OVERCLOCKED Q9300 (@3Ghz). What you can do is lower the voltage and see if the computer boots up. If not, raise it in small increments until it boots. Once it boots, run a stress test for a couple hours to see if is stable.
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lm
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by lm » Tue Apr 21, 2009 7:05 am
Don't the CPUs of today automatically idle at some low voltage and frequency? What kind of savings are we looking at with Q9550 at idle?
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ntavlas
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by ntavlas » Tue Apr 21, 2009 8:07 am
1.032 @ 3ghz is quite low, lower than the idle voltage set by speedstep at stock speeds. Which motherboard did you use? I smell gigabyte...
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lm
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by lm » Tue Apr 21, 2009 10:40 am
yamahaSHO wrote:Once it boots, run a stress test for a couple hours to see if is stable.
More like +24h... it's common enough to get errors from prime95 only after several hours.
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aristide1
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by aristide1 » Tue Apr 21, 2009 3:24 pm
ntavlas wrote:... I smell gigabyte...
I prefer the smell of souvlaki myself.
lm wrote:yamahaSHO wrote:Once it boots, run a stress test for a couple hours to see if is stable.
More like +24h... it's common enough to get errors from prime95 only after several hours.
That would be 1 Prime95 per CPU.
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yamahaSHO
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by yamahaSHO » Tue Apr 21, 2009 3:37 pm
I ran it for about 8 hours (while I slept at night) and it had no errors on my setup. I've been using it since then (October) and haven't had a problem. You can run it for 24 hours, but if it's stable for 4 hours or so, I'm sure it will be fine.
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aristide1
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by aristide1 » Tue Apr 21, 2009 4:28 pm
I've had failures after 20 hours, but if you're not folding you're OK.
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stephentw
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by stephentw » Wed Apr 22, 2009 3:01 am
Thanks everyone, sounds good. I'll give it a go when I get my new fan and psu.