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Moderate OC of i5 750 to 3.6

post #1 of 8
2/27/10 at 9:37am
Thread Starter 
Recently built a new system and not wanting to push it since i don't have the necessary cooling yet(venomous-x coming next week). I've oc slightly to 3.6ghz so far running prime right now for 5 hrs. Are these volts safe for a 24/7 system running?

Vcore= 1.237
vtt=2.75
pll=1.85
pch=1.1.

Well the volt that really concerns me is the vtt right now as i've read around some have it over 3 but intel states not to go over 2.1. I've tried prime with 2.5vtt and after 1-2 test passes i'd get a memory dumping bsod. So i've left it at 2.75 and been adjusting the vcore until i don't get a core stop in prime. Question now is should i lower my Bclk(200) so i can have a lower vtt to have running on a safe 24/7 system?
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post #2 of 8
2/27/10 at 9:38am
I would say that either you mistyped your VTT, or it's extremely high. I run mine with 1.411vcore (load), 1.4vtt, 1.85v pll, 1.1vpch and thats at 4.3ghz.
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post #3 of 8
2/27/10 at 9:46am
Quote:
Originally Posted by h2olaf View Post
Recently built a new system and not wanting to push it since i don't have the necessary cooling yet(venomous-x coming next week). I've oc slightly to 3.6ghz so far running prime right now for 5 hrs. Are these volts safe for a 24/7 system running?

Vcore= 1.237
vtt=2.75
pll=1.85
pch=1.1.

Well the volt that really concerns me is the vtt right now as i've read around some have it over 3 but intel states not to go over 2.1. I've tried prime with 2.5vtt and after 1-2 test passes i'd get a memory dumping bsod. So i've left it at 2.75 and been adjusting the vcore until i don't get a core stop in prime. Question now is should i lower my Bclk(200) so i can have a lower vtt to have running on a safe 24/7 system?
Leave pll at lowest value of 1.8
vtt is way too high. try 1.30 or 1.35

With that vcore you can go much further without harming your rig.
I have 3.8ghz at vcore 1.25 right now. Still testing stability...

BCLK 200 x19
Qpi 1.225
ram 1.65
rest at lowest value

So you can probable get 4.0ghz at vcore 1.30 and qpi 1.30-1.35 depending on how high your ram is clocked. Without any damage.
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post #4 of 8
2/27/10 at 10:19am
Thread Starter 
Oh man i must've not gotten enough sleep. You guys were right i had the vtt wrong. It's currently at 1.275 rather and i can't run prime stable at 1.25. Would 1.275 be safe for 24/7 since intel recommended is 1.21? i do plan to keep this system for a few yrs besides a change in gpu at a later time.
Edited by h2olaf - 2/27/10 at 10:49am
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post #5 of 8
2/27/10 at 3:12pm
Quote:
Originally Posted by h2olaf View Post
Oh man i must've not gotten enough sleep. You guys were right i had the vtt wrong. It's currently at 1.275 rather and i can't run prime stable at 1.25. Would 1.275 be safe for 24/7 since intel recommended is 1.21? i do plan to keep this system for a few yrs besides a change in gpu at a later time.
As long as you keep it below 1.30-1.35 you'll be fine. Above that you'll be in the grey zone in terms of lifespan.
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post #6 of 8
2/27/10 at 4:16pm
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I change a bit of the settings i had above. Now i have the bclk at 180*20 which puts the dram at 721.2mhz with a 2:8 divider and vtt at 1.2 now and same vcore. So far i'm running prime and been stable for 4 and half hrs now. Is it wise to have the dram freq lower than the specs from the manufactor? I was just concerned of having the vtt over the recommended by intel to make the change. only way to have a lower vtt was to lower he bclk or so it seems.
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post #7 of 8
2/27/10 at 4:42pm
I don't think the i5 can handle VTT voltage as well as the i7s, I wouldn't go over 1.25 for long-term usage.
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post #8 of 8
2/27/10 at 4:50pm
Quote:
Originally Posted by Salami991 View Post
I don't think the i5 can handle VTT voltage as well as the i7s, I wouldn't go over 1.25 for long-term usage.
This.
Could be right.
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