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Overclocking an i5 750

post #1 of 10
Thread Starter 
Frequent guest, first time post. I was trying to OC to 4.0, but it seems like it's requiring too much voltage for my tastes. So I'm trying for 3.8 now at 1.328v and it's been stable for 2 hours. I did have the voltage set to 1.32v but the 3rd core fails at 2 and a half hours. I don't want to go any lower in speed, but I need some advice.

I will go ahead and post my specs now and my current voltages:
Asus P7P55D-E
Intel i5 750
Cooler Master Hyper 212 EVO
Gigabyte GTX 550ti
500GB WD Caviar SE
32GB SanDisk ReadyCache
Corsair GS600

Exhaust fan: 120mm Arctic F12 PWM @77CFM
Intake fan: 120mm Arctic F12 3-pin @ 77CFM
Side fan: 120mm Apevia blue LED @ 40CFM

Load line calibration is enabled
All power saving features are disabled
RAM is locked at 1600MHz
BCLK is 200
Multi is 19
CPU voltage is 1.312 but under load it's 1.328
IMC is 1.2 (I think)
PCH is 1.10
PLL is 1.85

My temps under load are not exceeding 72 on the hottest core.

Like I said I'm still running Prime95 and if it can last for 4-6 hours I'll be happy.
post #2 of 10
Push the voltage. Think of it this way. If you blow it up you can get a nice I7 860 for 100 dollars to replace the 750
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post #3 of 10
Thread Starter 
The 750 is about $70 on EBay and the 860 is $150. I just bought these parts and I was on a tight budget. I would like some help with this overclock as this is all I got.

The Asus Mobo I have does make a slight high pitched noise near the socket. I think this May be coil whine since this happens when it's under load. Changing the CPU voltage does not make it better or worse. Do you think the PLL voltage would cause this?
post #4 of 10
Have you tried higher IMC? ~1.25-1.30 to see if this can stabilize your clocks? Also regarding vcore 1.328 is completely safe for Lynnfield. I have my 870 @ 4 GHz 1.328V since 2011 and is still going. You can go up to 1.350V and be safe. although 1.40V is the max recommended on air I don't advice to go to that for 24/7.
Edited by HeadlessKnight - 3/15/14 at 2:32pm
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post #5 of 10
Thread Starter 
Thanks Headless. If my rig is still unstable after this current run, I'll up the IMC to 1.3 to see if that helps.
post #6 of 10
Quote:
Originally Posted by Posiris View Post

The 750 is about $70 on EBay and the 860 is $150. I just bought these parts and I was on a tight budget. I would like some help with this overclock as this is all I got.

The Asus Mobo I have does make a slight high pitched noise near the socket. I think this May be coil whine since this happens when it's under load. Changing the CPU voltage does not make it better or worse. Do you think the PLL voltage would cause this?

wink.gif


http://www.ebay.com/itm/Intel-Xeon-X3470-Quad-Core-CPU-2-93GHz-3-6GHz-Turbo-LGA1156-SLBJH-Processor-/400677477579?pt=CPUs&hash=item5d4a3d1ccb

X3470 = I7 870

Good overclock guide for you

http://www.overclock.net/t/605848/i5-i7-lga-1156-overclocking-guide-to-4ghz
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post #7 of 10
Thread Starter 
I'll give it a look. I'm pretty new to this and I've done research, but you can only do so much before you just have to get your feet wet. Lol. I will post my full specs after work tonight for some guidance. For now, I turned down my PLL to 1.85 and turned up the PCI-E clock to 102. Supposedly that can help with stability.
post #8 of 10
Is this manly for gaming and what about just trying for 3.5/3.6Ghz? I don't think a 550ti needs a 750 clocked at 3.8Ghz, so I wouldn't focus too much on it.
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post #9 of 10
Thread Starter 
This is for gaming. I would like to get my CPU set to a nice clock speed for long term use. It will be gaming, photoshop, and your usual YouTube and web browsing.
post #10 of 10
Thread Starter 
Just wanted to post back and let you guys know that I have it at 4.0 GHz stable at 1.35v. Under load the hottest core is 82*C. I think I was just upping the voltages on other things that weren't necessary and that's what was causing the problem. The other thing was that I wasn't taking advantage of my multiplier. So base clock is 190 with 21 multi. My 3DMark 11 score turned out to be 6700 on physics. smile.gif So it's officially over 4x faster than my old CPU.

Thanks for the help and links! If you have more questions let me know. I will try to post my bios settings here for others who have an Asus P7P55D-E motherboard.
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