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Need help OC'ing i5-760 with H70 and EVGA P55 Classified

post #1 of 6
Thread Starter 
http://valid.canardpc.com/show_oc.php?id=1559694

4.0GHz, but I'm hoping to see a better balance of values.... Could someone help me out?

I disabled Vdroop, C-State, and SpeedStep in my BIOS, then put in the following settings manually:

CPU Frequency: 200MHz
Multiplier: 20x
CPU Vcore: 1.2625V
DIMM Voltage: 1.50V

Then under Memory Configurations I set the frequency to 1067 (2:8; FSB: DRAM) so that it would shoot for 1600MHz, then manually changed the timings to 9-9-9-24 since for some reason it changed the settings to 11-11-11-29. I left the tRFC at 88 and command rate at 1T.

However, as you can see here the voltage is set to 1.27. Now that I'm running prime95, not only has my voltage shot up to 1.282, but my temps are considerably higher than I would normally expect them to be considering I'm using a H70 (after about 10 minutes of prime95 my base CPU temp is sticking around 72, peaked at 75). Now I know that 72 isn't anything to worry about, especially since prime95 is going to be utilizing my CPU a lot more than most games will, but I was hoping to shoot for at least a 4.2 OC on this setup considering I have the EVGA P55 Classified and such a superb cooler.

Also, I let prime95 run a little longer and blue-screened after about a half-hour, so obviously something isn't stable. I know people have gotten 4GHz OC's with under 1.3 voltage, so I don't know what I could be doing wrong. On the other hand, I'm a noob to overclocking (this is pretty much my first time) so I'm not exactly 100% knowledgeable about what I'm doing...

Any tips on how to get the VCore to work "correctly" and possibly optimize this OC a bit more? Help would be much appreciated!
    
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post #2 of 6
Is LLC on? That may be causing the voltage spike. Also, tighten the Timings on the Ram to 8-9-8-22
    
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post #3 of 6
72c with that V is pretty bad. WHat are your ambient temps? I think you may need to re-seat.
WHen I was running my i5 750 @ 1.464v It was loading around 77c in Prime95

As for 4Ghz @ 1.2625v, thats pretty low and you should start somwhere more conservative and work your way down to find lowest stable V. In your case, if it only BSOD'd after 30 mins I would say you arent far from the stable mark, so maybe try 1.3v
Edited by mental.patient - 12/28/10 at 12:30pm
    
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post #4 of 6
Thread Starter 
Quote:
Originally Posted by MR KROGOTH View Post
Is LLC on? That may be causing the voltage spike. Also, tighten the Timings on the Ram to 8-9-8-22
I couldn't find an "LLC" option anywhere in the BIOS, but I have disabled Vdroop. I just put back my settings and changed the RAM timings to 8-9-8-22.

Quote:
Originally Posted by mental.patient View Post
72c with that V is pretty bad. WHat are your ambient temps? I think you may need to re-seat.
WHen I was running my i5 750 @ 1.464v It was loading around 77c in Prime95

As for 4Ghz @ 1.2625v, thats pretty low and you should start somwhere more conservative and work your way down to find lowest stable V. In your case, if it only BSOD'd after 30 mins I would say you arent far from the stable mark, so maybe try 1.3v
I really hope I don't have to re-seat. If I do, I'll probably need to get some AS5 to re-do the thermal... However, I only have one fan attached to my H70 since I can't put the other fan on until I have the extension cables I ordered for my two 8-pin CPU connectors that are currently running over the top of my motherboard. (it's a long story, but to make it short I don't have room to mount the second fan yet and I don't know how much that would affect temperatures)

I have currently re-inputed settings with a 1.2875 CPU vcore, going to turn on prime95 as soon as I submit this post.

CPU-Z with prime95 running: http://valid.canardpc.com/show_oc.php?id=1560735
Edited by DSG - 12/28/10 at 12:41pm
    
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post #5 of 6
Hmm, not sure how much of a deficit only 1 fan would give. Also make sure you are using the H70 as intake and not exhaust. Mine was originally exhaust, but as intake I dropped 5c, whilst doing nothing but reversing the fans.
    
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post #6 of 6
Thread Starter 
Wait... I forgot to mention that I have both a "Boot CPU Vcore" and "Eventual CPU Vcore." I've been changing both to be the same to the voltage I want accordingly, but someone told me that I shouldn't be touching the eventual vcore (the one that's "after memory sizing"). When I switched that one back to auto, my voltage even with a 200x20 setup is dropped to 1.223. If I even start prime I immediately blue screen.

What's the deal with the two vcore settings?

Quote:
Originally Posted by mental.patient View Post
Hmm, not sure how much of a deficit only 1 fan would give. Also make sure you are using the H70 as intake and not exhaust. Mine was originally exhaust, but as intake I dropped 5c, whilst doing nothing but reversing the fans.
I'm 99.9% sure I have it set up as intake.
    
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2x1TB WD Caviar Black + 500GB WD Caviar Black Sony Optiarc Windows 7 64-Bit 24" ASUS VW246H Monitor 
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