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--- Risking life, limb and voltage for 5ghz --- - Page 2

post #11 of 24
Quote:
Originally Posted by overclocktilyerdrop View Post
Aren't you worried about damage in the long run at 1.45v? I thought heat(which water cooling eliminates) and electron migration are seperate things?

Even my 1.41v is too high according to:
Dont know where that info came from. Ive been puting in 1.4+v since launch day and its still rock solid.
Heck some people are running 1.52ish at 5gigs and I havent heard of one dieing yet.
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post #12 of 24
Thread Starter 
Quote:
Originally Posted by Lost-boi View Post
Dont know where that info came from.
According to those forums, it came from their discussions with Intel


Quote:
Originally Posted by Lost-boi View Post
Ive been puting in 1.4+v since launch day and its still rock solid.
Heck some people are running 1.52ish at 5gigs and I havent heard of one dieing yet.
To start with, you're on water so temps are not an issue for u(if I did 1.45v I'd be at 90C ). I also like low noise so my fans are only 1200rpm. Even with 2000rpm fans, air cooling can't compare to water.

Its nice u have the guts to run yours at 1.45v even tho Sandy Bridge hasn't been out long enough for concrete "safe" limits to emerge.

CPUs normally last 10 years. If 1.45v reduces that to 5 years, hell yeah sign me up too. But until I know for sure, I need my chip to last a year at least lol.
post #13 of 24
I've been running 5 ghz @ 1.45v for 2 months now, no problems. You might have a shot at core lowering voltage by lowering CPU PLL to 1.72v (stock 1.8v), I had to lower mine down to 1.65v to avoid increasing vcore for AVX Linpack sp1 stability. My cooler can't really handle more than 1.46v tbh.

You have a great chip, 1.41v is more than safe. If it wasn't I'd already be experiencing degradation after 2 months of 1.45v wouldn't you think? Just last week I passed AVX Linpack SP1 which wouldn't be possible had my chip been degraded whatsoever as that is THE hardest stress test for sandy bridge.

77c is ok.. I would upgrade the cooling if you want to push more than 1.41v, no doubt about it.


At the end of the day however, 5 ghz is mega overkill, if you don't feel comfortable tweaking a chip that has many unknowns such as safe voltage and safe temps, you may consider backing it down to 4.9ghz. No one knows for sure how much voltage these can handle, I'm prepared to have my chip degrade, other people are not.
Edited by Scorpion667 - 3/18/11 at 10:33am
    
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post #14 of 24
Quote:
Originally Posted by overclocktilyerdrop View Post
According to those forums, it came from their discussions with Intel
Meh, I dont trust anything I read on the internet lol.
Granted im at 4.8 right now with 1.45v but load temps are only 53c about. I might try to lower the voltage a little and see how low I can go.
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post #15 of 24
I've read somewhere here on the forums that Intel SpeedStep should be disabled for better OC'ing. I don't really know too much about it though, maybe someone can elaborate on this?
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post #16 of 24
Thread Starter 
Quote:
Originally Posted by Luminosity47 View Post
I've read somewhere here on the forums that Intel SpeedStep should be disabled for better OC'ing.
Good point. I'd forgotten that Speedstep does generally hinders overclocking. Need to tessst right away

However, for 24/7 usage where the CPU spends much time on low load (Word processing, web-browsing, movie playback), Speedstep is preferable for power saving.

U've got a Q6600 @ 3.4ghz, if its B3 stepping then thats a hell amazing overclock, and decent even for G0.
post #17 of 24
Unlike previous generations, EIST should not affect the overclockability of Sandy Bridge chips at all.
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post #18 of 24
Thread Starter 
Quote:
Originally Posted by compudaze View Post
Unlike previous generations, EIST should not affect the overclockability of Sandy Bridge chips at all.

I havent tested yet but if thats the case then its a great power-saving-leap forward.

Quick question: my chip is not volting down @1600mhz. Can I get it to undervolt at idle? (without affecting max OC)

EIST and all three C-states are enabled in P8P67 Pro bios
post #19 of 24
Quote:
Originally Posted by overclocktilyerdrop View Post
I havent tested yet but if thats the case then its a great power-saving-leap forward.

Quick question: my chip is not volting down @1600mhz. Can I get it to undervolt at idle? (without affecting max OC)

EIST and all three C-states are enabled in P8P67 Pro bios
Check windows power management.
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post #20 of 24
have to use offset voltage and not manual to get the Vcore to lower.

anyways, I've had now two sandy bridges with two different motherboards. (gigabyte UD4 and Asus Deluxe). here's my personal experiences.

my first an "A" batch, OC'd like poop. needed internal PLL for anything over 4.5GHz, and needed 1.38V for 4.6GHz. above that, it needed insane voltages for 4.7GHz/4.8GHz like around 1.46v, but I could never get it stable at 5.0GHz even with 1.48v-1.51v. it ran 4.8GHz for a week at 1.44-1.64v before degrading to the point where it wouldn't even run stock clocks with my 2133MHz memory anymore. (had to run 1866 or lower)

my second, a "C" batch is pretty decent but not amazing. needs internal PLL for anything over 4.7GHz. does 4.5GHz 1.3v, 4.7GHz 1.376v, 4.8GHz 1.4v, 4.9GHz 1.43v but 5.0GHz needs something over 1.45V which I'm not comfortable using so I didn't even test. (I'm guessing somewhere around 1.476-1.5v for 5.0). so my dream for that magical 5.0 number was just a pipe dream

so, consider yourself VERY lucky if you have a chip that will do 5.0GHz with 1.41v. Asus says in their testing of 100+ CPU's only about 2% of them were able to achieve 5.0 and higher and typically in the mid 1.45v range.

and a note about voltage, I'd consider anything 1.425v or lower to be fairly safe as long as your temps are <75c, preferably 70c or lower. but if you're constantly beating it up with torture tests or BOINC then I'd prefer 1.4v or lower. what causes electromigration is the combination of heat and current. (i.e. higher voltage = more current. and higher MHz = more current too)

for stability testing I've found that medium size FFT's and Prime "blend" seem to find instabilities the most. see, the decode engine in the chip seems to be the weak link and this hits it harder. (I typically do 1024KB FFT's with 4096MB) meanwhile, IBT/LinX just hit the FPU very hard but prime still seems to hit the weak points better.
Edited by s74r1 - 3/18/11 at 2:59pm
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