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Help me Stabilize my i5 750 at 4.2 - Page 2

post #11 of 33
Quote:
Originally Posted by Hatfieco View Post

His bus speed is about as high as lynnfield likes to go. I think the record on ln2 is only 209 lol.

Oh okay, well it might have been on 1136 that 20 was better for stability then 21 tongue.gif
 
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post #12 of 33
Thread Starter 
Quote:
Originally Posted by Hatfieco View Post

The difference from 4.0 to 4.2 in lynnfield is minimal from what Ive seen. You shouldnt need the 21 multiplier if your going for 4.0 so 200x20 should be plenty. My pch voltage is a bit lower than yours but everything else is pretty close really. You said your only hitting 60 at full load what kind of cooling are you using?

I just bought the Rosewill Thor V2 for 100$ after rebate and the Gamer storm Assassin for $39+ shipping then installed them both. During hours of prime 95 I'm not even going above 60 and that's with the Thor V2 fans set on the lowest setting. I'm pretty happy with the purchases since before I was using a crappy case + stock cpu cooler and would hit 85c under load.

I went back down to 4.0 but was having trouble stabilizing still where my system randomly froze twice during web browsing + prime 95 so I watched a new youtube video where the guy took his to 4.0 so I used his settings while changing only my voltages a bit and I seem to have found a stable 4.0 since I haven't froze and prime95 has run perfectly fine for the last 2 hours.

My current new 4.0 stable settings are below, what can I do to hit 4.2 or do you think I should just throw in my hat and be happy with 4.0? It's definitely a major difference since I've run this thing at stock for the past 3-4 years and now my PC boots up really fast and applications load way faster.






Pic of the setup:

post #13 of 33
Looks like we have a pretty similar setup. I've set mine at 4GHz, as jumping to 4.2 would require quite a bit more voltage than I want to run 24/7.

Here are the settings I used to get 4.2 (And most of which I'm still using for 4)

Enable CPU Thermal Monitor and Bi-Directional PROCHOT in your last screen.

Manually set your PCI-E frequency to 100MHz (I currently have mine at 101 - but 100 worked as well. Just testing)

Disable Spread Spectrum (Should be in Advanced Frequency Settings, although it's a hidden option for Gigabyte boards. You'll need to press Ctrl+F1 at the main BIOS screen to unlock it. Otherwise it won't even appear)

I was also running 210x20 to hit 4.2. You may need a tad more vcore, and possibly another notch to your QPI/VTT voltage as well. You could also try disabling virtualization, but it didn't make a difference for me so I left it on.

Hope that helps.
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post #14 of 33
Thread Starter 
Quote:
Originally Posted by Shift. View Post

Looks like we have a pretty similar setup. I've set mine at 4GHz, as jumping to 4.2 would require quite a bit more voltage than I want to run 24/7.

Here are the settings I used to get 4.2 (And most of which I'm still using for 4)

Enable CPU Thermal Monitor and Bi-Directional PROCHOT in your last screen.

Manually set your PCI-E frequency to 100MHz (I currently have mine at 101 - but 100 worked as well. Just testing)

Disable Spread Spectrum (Should be in Advanced Frequency Settings, although it's a hidden option for Gigabyte boards. You'll need to press Ctrl+F1 at the main BIOS screen to unlock it. Otherwise it won't even appear)

I was also running 210x20 to hit 4.2. You may need a tad more vcore, and possibly another notch to your QPI/VTT voltage as well. You could also try disabling virtualization, but it didn't make a difference for me so I left it on.

Hope that helps.

Thanks for the tips. Will give them a shot in the morning. What voltage did you want to stay under for 24/7 running? I want the 4.2OC but if its not safe to run for 24/7 then maybe I should just back down to 4.0. I want this to last me at least another 1-2years. So I don't know what good 24/7 voltages are? Under 1.4 vcore and 1.3 vtt?
post #15 of 33
1.4 is intels max vid for the 750. Vtt is the same I think.

http://ark.intel.com/products/42915/Intel-Core-i5-750-Processor-8M-Cache-2_66-GHz
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post #16 of 33
set your vtt to 1.21 and then your multi really low, enough that as you raise the bclk your still going to be below 2.66ghz. raise th bclk by 10 eeach time you reboot. run Intel burn test 5 times each time.

Once you have max bclk at 1.21, then start to up the multiplier. wouldn't advise going past 1.35 vcore for 24/7. will be plenty fast and safe. trying to burn out this great chip in two years is really, really stupid.
    
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post #17 of 33
My chips been at 1.39 since the day I got it which was 2 days after release in 2010... No signs of degradition at all. Still rock solid stable at 4.0 with perfect temps. Its below intels 1.4 vid range which is always a very conservative number from them. Up to 1.4 is perfectly safe as long as the temps stay down. Luckily the 45nm doesnt mind heat like the smaller chips do.
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post #18 of 33
Thread Starter 
Quote:
Originally Posted by Juliancahillane View Post

set your vtt to 1.21 and then your multi really low, enough that as you raise the bclk your still going to be below 2.66ghz. raise th bclk by 10 eeach time you reboot. run Intel burn test 5 times each time.

Once you have max bclk at 1.21, then start to up the multiplier. wouldn't advise going past 1.35 vcore for 24/7. will be plenty fast and safe. trying to burn out this great chip in two years is really, really stupid.

Quote:
Originally Posted by Hatfieco View Post

My chips been at 1.39 since the day I got it which was 2 days after release in 2010... No signs of degradition at all. Still rock solid stable at 4.0 with perfect temps. Its below intels 1.4 vid range which is always a very conservative number from them. Up to 1.4 is perfectly safe as long as the temps stay down. Luckily the 45nm doesnt mind heat like the smaller chips do.

I ended up trying 4.1 first and ran Prime95 for 8 hours with no problem so I seem to be stable. Are these voltages I have safe? I want it to last 2+ years since Haswell isn't looking that great with those early benchmarks. Should I just leave these voltages or try to lower vcore or vtt since I'm stable until I don't see it stable? Also what's the recommended VTT? 1.3? I'm trying not to go above 1.4 on Vcore but not sure what I should use as my safe number for vtt.



Edited by cooler2442 - 2/2/13 at 9:32am
post #19 of 33
QPI/VTT voltage is fine. I think mine is the same now as well.

Vcore is a little high for my liking, but that's just me. As long as temps are low you should be good. If I remember correctly, I think I was at around 1.42v for 4.2GHz, and I didn't even bother testing for stability; just ran a few benchmarks.

And make sure you set your PCIe frequency manually to 100MHz, as you don't want to have it fluctuate on auto.
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post #20 of 33
I will repeat one more time, and please listen as ive done ALOT of reasearch with this chip. I was in your position 3 years ago.

1.21 vtt for long term safety. No Higher. You do NOT need more unles your running with all 4 memory channels full or 2000mhz ram. and its not safe

above 3.8Ghz is POINTLESS

how to overclock an i5 750 in a few easy steps:

- find your maximum bclk overclock using no more than 1.21vtt FIRST. this gives you maximum memory bus and interconnect throughput for any given clock cycle.
- to do this keep the cpu multiplier very low so that any instability while finding your maximum bclk is DEFINATELY not because of the cpu clock.
- once your stable with your bclk, its time to overclock the cpu GHz. you should have gotten around 190 - 200 bclk.
- start to up the cpu multi using stock voltage (1.26v roughly in BIOS) first - see how high you get.
- then when instability is found begin to up the vcore.
- dont go higher than about 1.35v.

you dont need any more than 5 runs using intel burn test for quick testing. Only once your 95% finished will you begin testing 10 - 20 runs with 4GB memory being used.
You may find instability. Only raise the vcore to stabilise and if you find you need above 1.35v ITS NOT WORTH IT.

DONT LET YOUR CHIP GO ANY HIGHER THAN 73C.
    
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