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P67A GD55 D3 / i5 2500k OC failed @ 4.5Ghz, why? - Page 3

post #21 of 27
Quote:
Originally Posted by dvaaland View Post

Vcore offset means that the voltage goes down when load goes down? In that case I do. Prime95 is still running, so I'll wait and see before I change anything.

Vcore offset has a similar function as LLC in that it compensates for the voltage set in the bios drooping and increases it accordingly. As I stated initially, enable C1E and other power saving features, enable turbo and oc the multi to 4.5, adjust your vcore accordingly, 1.35 seems like a good place to start. Test and see how you get on.
post #22 of 27
Thread Starter 
Prime95 has run for 1 hour now and still not crashed at 4.5ghz 1.35v.

What would I have to do to OC with turbo boost? Change the multipliers to 45 and vcore to 1.35v (if this works), but what else? Will the voltage go down as the core speed goes down?
post #23 of 27
Thread Starter 
I know I should run Prime95 over night to be sure if its stable, but I cant do that today. Can I be pretty sure after a few hours or is it like ~12 hours or nothing?
post #24 of 27
Thread Starter 
After 2 hourd and 45 minutes i got an error in Prime95 in worker #4, the rest of them continued until I stopped them.

Cannot initialize FFT code, errcode=1005
Unable to allocate memory. One possible cause is the operating system's swap area is too small.

I did a 2 hour memtest yesterday as I was flashing the BIOS, so I feel certain that there's nothing wrong with the memory. Could it have something to do with swap area or that I've got 16 gb installed? And I'm guessing that I would have got a BSOD if there was something wrong with CPU OC?

What to do?
post #25 of 27
As you are running 4 sticks of ram on a dual channel memory controller, you are putting a lot of stress on the IMC and the 2nd gen I7's are not known for their robust IMC's. the fact that you got an error in prime in stead of bsod means you are close to stable. I would try bumping the system agent voltage a little bit. that might help stabilize the IMC.
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post #26 of 27
Quote:
Originally Posted by dvaaland View Post

Hi!
Overclocking is new for me, but I've bought some new components for my computer, so that I could do some moderate OC to boost performance, but I'm not quite getting it right, so I need some help.
I've got:
Antec P183 v3 CASE /w 2x 120mm fans
Corsair HX 850W PSU
MSI P67A GD55
Intel i5 2500k 3,3Ghz
4x 4GB Corsair Vengeance 1600Mhz CL8 (1,5v)
Sapphire Radeon HD 6970 2GB GDDR5
Corsair SSD Force Series GT 180GB
Corsair H80 Hydro Series (stock fans replaced with Noctua NF-F12 fans).
Noctua NT-H1 thermal paste (just applied it).
I have read dozens of reviews, tutorials etc, of how to OC my motherboard and prosessor, and I figured I would try to go to 4.5Ghz. BIOS is up to date and idle temp @ 3,3 Ghz is 25-30 celcius @ normal room temp.
I just tried to do 4,5 Ghz with some adjustments I found that worked for others with similar system, but I only got to test5/6 in Prime95 before bluescreen. CPU idle temp @ 4,5 Ghz was around 30 celcius, and never over 62 celcius in Prime95 (tho it only lasted 3-4 minutes before crash).
Here's my adjustments in BIOS @ 4.5 Ghz:


As you can see I have put DRAM timing mode to link, so I could change CL from 9 to 8, but thats the only thing I have changed in Advanced DRAM configuration.
As I'm writing this I'm running Prime95 @ 4.2 Ghz with vcore at 1,220v (nothing else changed), and it has run in ~22 minutes (test 21, and never been over 59 celcius) and seems OK. But I know I can go higher, I just need someone to point me in the right direction of what I might be doing wrong (which can be a lot of things, cus this is brand new to me).
Thank you for any help, and If there's more information you need, ask smile.gif

The bios is showing vccio at 1.344V, have you tried lowering that? too much can cause instability too. I don't have a sandy rig set up right now to test with 4 x 4Gb memory but I've never needed more than 1.2V even for high overclocks with 2 x dimms. Try 1.1 - 1.15V.
    
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post #27 of 27
Thread Starter 
I havent had time to properly stress test the system, but I've done some testing at 4.5ghz @ 1.35v and it seems stable, except for the 1005 error (which probably doesnt have anything to do with the CPU OC). I'm trying 4.2Ghz for now, and that seems stable aswell. Tho I want to OC with turbo boost, since theres no need for 4.5Ghgz 24/7. I know which voltage I'm gonna try, but what else should I do? I tried to put the multiplier down to 33 (default), and the multipliers for turbo boost to 45, but the core speed never went over 3300mhz when stress testing, and the voltage seemed to always stay at 1.35 (even on idle).
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