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Complete Overclocking Guide: Sandy Bridge & Ivy Bridge | *ASRock Edition* - Page 54

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post #531 of 9486
Quote:
Originally Posted by mitchrapp1 View Post

Well, I've upped the offset to +0.030V and it's been stable on normal use/idle for the past 13 hours with no reboots. I'll update if I get any more reboots.

Sweet!! Keep us updated. thumb.gif
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post #532 of 9486
Quote:
Originally Posted by Jpmboy View Post

Hi all, I'm wondering if anyone can help me understand the relationship between the VID at a given multiplier and the Vcore we see in CPUz under p95 load. My set up always shows a lower Vcore than VID... Sometime a lot lower. Why would this result in a stable setup? I mean, I thought the VID was the volts needed by the chip at that multi? So seeing vcore so much lower .... Well, makes me nervous that it's just waiting for the right moment to bsod. Even worse, under some stress conditions the VID will actually change (both core temp and real temp).
Is the CPUz vcore supposed to be the same as bios vcore? Or >= VID?
Or is this just a stupid irrelevant question?

When some one explained it to me it was like you just said. I way i understand it, is that its basically an estimate of the voltage needed at X multiplier. My VID for 45 multi is 1.40ish at full load but the voltage required to get 4.5ghz stable is much lower. The main thing you have to pay attention to when overclocking is the voltage in bios and the voltage that's displayed in cpu-z because this is what the cpu is being fed.

At least this is is what i gathered when someone explained it to me since its quite different from older 775 cpus that had just 1 VID vs sand bridge that has a VID for each multiplier if i remember right.

Bios vcore will always be higher then whats displayed in cpu-z because of V-drop & V-droop this is where LLC come into play to help minimize the gap

I could be off a little on this but this is from memory so maybe someone else can explain it a little better.
Edited by Lucky 23 - 5/10/12 at 7:11pm
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post #533 of 9486
I put my LLC to level 3, so that the Vcore I see in my BIOS is about the same as in CPU-Z during load. You may only need lvl4 or higher at lvl2, but you can play with the settings to your liking.
    
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post #534 of 9486
Bumped my multiplier up to 44. Set offset to .010 and LLC at lvl 3. any suggestions??

375
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post #535 of 9486
Thanks lucky. I have read that we should just ignore VID... It just seems odd that (absent LLC effects) I can get a stable 47 with a p95 vcore of 1.344-1.352 (and lower during the run) with that vcore of 1.3651 staring back. At 48 the discrepancy is even larger. With my chip, 48 needs +0.125 or more but still reads 30 mV below the 48xVID. At 49 and 50 (which Kenny punked me on!) this gap holds (but required me to lower PLL and increase vtt.). With the H80 I can't keep temps below 80oC... A personal target, so 47 is the 24/7 I've stuck with.

Wouldn't it be nice if intel lifted the kimono on their K and X series chips to provide some more insight on performance tuning the chips. Logical follow up to the Tuning plan which I did buy.

Have to admit, tweaking this CPU has been fun.
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post #536 of 9486
Quote:
Originally Posted by blulight View Post

Bumped my multiplier up to 44. Set offset to .010 and LLC at lvl 3. any suggestions??
375

Is it failing w/ these settings? How long have you run P95?
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post #537 of 9486
Ran for 30 minutes no errors. Running blend test again for an hour, will report back.

**Also enable Internal PLL Overvoltage...think I had to last time i tried to push over 4.3 failed. Should I try with it disabled?
Edited by blulight - 5/11/12 at 11:14am
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post #538 of 9486
I would run it longer but just my opinion. Its looking good im at a +0.015 offset for 4.5ghz LLC 3
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post #539 of 9486
Thank you for this! Some of the other guides are much less clear, and I've been somewhat confused about all of the details. This has clarified things immensely and I will be doing my first OC over the weekend, assuming the case I got isn't defective (which it may be...ugh).
post #540 of 9486
Hello everyone, I just got my new 2500k and z68 Extreme3 Gen3 and am working on finding my 24/7 overclock. I'm trying to hit 4.5Ghz because in the Passmark Performance Test, the benchmark scores at ~9100, which is in fact over 9000. It is important to me that my overclock is over 9000.

However, @4.5Ghz keeps failing "very high" Intel Burn Tests. Standard and high succeed. My settings, at 4.5Ghz:
LLC 2 and 3 both tried
Offset: +.010 to +.020
Max Temp: 80°c

Just tried a very high test with .020 and LLC3 and BSODed during the 5th pass =/
Any ideas? Should I just keep bumping up the offset? I'd like to see a stable 4.5Ghz before going to bed tonight.

EDIT: Yes, 44 passes. 44 appears completely stable.

Question about Intel Burn Test: I'm unable to begin a maximum stress test. When I try, I get the error message that I do not have enough available RAM to perform the test. I have 8gb of RAM in my system now, and in fact with my previous motherboard/CPU I used the exact same two DIMMs and had no issues running IBT at maximum. Is this a sign of a problem in my system or is it a problem with IBT?
Edited by toothman - 5/12/12 at 3:16am
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My baby
(12 items)
 
  
CPUMotherboardGraphicsRAM
Intel i5-2500k ASRock z68 Extreme3 Gen3 GIGABYTE Radeon HD 6950 1GB G.SKILL Ripjaws Series 8GB (2 x 4GB) DDR3 1600 
Hard DriveOptical DriveCoolingMonitor
Seagate Barracuda 500GB 7200 RPM 16MB Cache SAT... ASUS 24X DVD Burner COOLER MASTER Hyper 212 Plus Hanns-G 27.5'' 3ms WideScreen LCD 1920x1200 res... 
KeyboardPowerCaseMouse
Nostromo Seasonic SS-850HT 850W 80+ Silver Rosewill Blackbone RAZER DeathAdder  
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