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[Solved!] Need help overclocking 2500k with ASRock P67 Pro3

post #1 of 35
Thread Starter 
I need some help overclocking my i5-2500k to the desired 4.5GHz.

Right now I have the vcore at 3.65v but CPU-Z claims it's only 3.60v for some reason.

BCLK is set to 100 MHz
Spread Spectrum is Disabled
Turbo Boost Power Limit is set to Auto
Short Duration Power limit: 118w
Long duration power limit: 95w
Long duration maintained: 1 sec
PLL Overvoltage is Disabled
and all other voltage setting are also set to auto including the memory.

I have Corsair Vengeance 1600MHz ram, but I'm currently running it at default 1333MHz and auto voltage.

As the topic title says, I of course have the ASRock P67 Pro3 and the Intel i5-2500k.

I've stopped the BSOD's but I get errors now in Prime95. All today I kept getting the error "FATAL ERROR: Rounding was 0.5, expect less than 0.4"

But now with the vcore at 3.65v (CPU-Z says 3.60v confused.gif) I'm getting the Prime95 error "FATAL ERROR: Resulting sum was 6672224955982.738, expected: 6612951344005.901 Hardware failure detected, consult stress.txt file.

I really need some help, I don't know where to go from here. frown.gif
Edited by EliteGamer83 - 8/2/11 at 5:37pm
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Plastic Shuriken
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post #2 of 35
as for the voltage showing lower than what it is set to, that is vdroop and is normal. if your bios has llc, enabling that will compensate for the vdroop. you should definately raise the long duration power limit. 95w is what the cpu is rated for at stock, for stability at higher clock speeds and voltage, the cpu will need more power. also, try enabling pll overvoltage.
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post #3 of 35
First thing you wana do is enable spread spectrum, it's not the same as overclocking the older cpu's. Spread spectrum can be beneficial to sandybridge and unless you face any issues or messing around with your BCLK it shoudl be left on.

Second you wana go ahead and increase the power limit:

Short Duration Power limit: 250w
Long duration power limit: 250w

Then you can go ahead and start overclocking. Mind you leave the RAM and safety features on default settings and stock timings and voltage. Don't overclock the cpu by using auto voltage, it will more than likely give you more voltage than required. You can use offset or manual voltage.
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post #4 of 35
Thread Starter 
I bumped the vcore again to 1.37v, and now Prime95 has made it though the first set of tests and is already halfway through the second set, it only made it to test 12 before.

I'm trying not to keep my hopes up as I will probably be disappointed a few hours from now,

The highest temp I've seen with these settings during Prime95 is 79C maybe 80 on one core. But they're pretty much staying between 73 and 78C.

I'll post back with the results on the Prime95 test I'm running now. If (fingers crossed) it throws up an error again, then I'll try your suggestions above, and post back with the results.
Edited by EliteGamer83 - 8/2/11 at 6:02pm
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Plastic Shuriken
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post #5 of 35
Thread Starter 
Well, it lasted much longer, 1 hour and 5 minutes, 75 tests. Then I got the error, FATAL ERROR: Rounding was 0.4995117188, expected less than 0.4,

bummer. I'll try your suggestions above now, see what kind of results I get.

(edit) Testing with Prime95 Blend 4.5GHz with spread spectrum enabled with vcore at 1.35v and turbo boost power limit at 250 short and 250 long.

**IMPORTANT EDIT 2**
Since I've upped the turbo boost power limit, I'm getting max temps of like 85-86C...
Granted, this is during Prime95, not real world conditions but still. It makes me nervous to run it that hot for 12+ hours in Prime95. What should I do? It's been running with no errors for about 40 minutes since I've increased the turbo booster power limit.

Edited by EliteGamer83 - 8/2/11 at 7:39pm
Plastic Shuriken
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Plastic Shuriken
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post #6 of 35
maybe more volts?

here are some good settings on my board for 4.7Ghz

I use offset.

Here are my settings:

High Current 255
Low Current 255
Duration 1sec. (Default)
MaxCore Current 260

CPU LLC 3 (1 is highest)
Spread Spectrum Off
Power Saving Off
CPU Overvoltage disabled
Additional Turbo voltage +.0004 (can't turn this off)

CPU Offset +.090
VTT 1.116
CPU PLL 1.791v
Everything else to auto
VCCSA Auto
PCH Auto

CPU Config:
C3/C6 Disabled, all other options Auto

Gives me 1.400-1.408 for my 4.7Ghz.

th_cpu_settings.png

th_bios_v.png


You could tweak it off that. Set to 45x, maybe even drop vtt down one from mine. keep the volts around where you are now and continue testing. use 1344FFT and 1792FFT. It's know that those are the hardest for us to pass. Seems pretty accurate to say if you can pass 15-30 minutes of each, you'll pass a 12hr blend.
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post #7 of 35
Might be a good idea to invest in a better cooler.
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post #8 of 35
Thread Starter 
It never ran that hot before :\ And it never runs that hot during normal use of Photoshop or even gaming. It tops off then at about 69C or 72C.

This is a torture test after all.... right? worriedsmiley.gif

This is completely thinking out loud, but some time (far into the future) I was thinking of getting the Corsair H60. I looked at the Mugen 2, and I know it's amazing, but I don't think it'll fit with my ram (the corsair vengeance has tall spreaders).

If you're going to bother upgrading, why not go for a cheaper all-in-one liquid cooling solution?

*EDIT*
It must be what test Prime95 is running, because it completed the set and started a new one, and all the cores dropped down to 71C-76C now.
Edited by EliteGamer83 - 8/2/11 at 8:15pm
Plastic Shuriken
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Plastic Shuriken
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post #9 of 35
Thread Starter 
Gah! it was running perfect for 3 1/2 hrs or so, but then me being thoughtless person I am unplugged my wireless mouse adapter froze the PC.

I started the test again then, all same settings, but about 15 minutes in during the blend test I got a BSOD with the error 0x101! What gives!? It ran fine for 3+ hours before.
Plastic Shuriken
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Plastic Shuriken
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post #10 of 35
Thread Starter 
I have a question, for the "Core Current Limit" by default it's set to 150, should I change that? I haven't touched it since I got the PC/started overclocking.
Plastic Shuriken
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Plastic Shuriken
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128GB Crucial M4 SSD 1TB Seagate Barracuda 2TB Western Digital Caviar Black 500GB Samsung Spinpoint F3 
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