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Hitting OC wall at 4.1ghz? (intel 2600k)

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May 3, 2011 10:19:25 PM

I seem to be hitting an OC wall at 4.1ghz with a bclk 100 x 41 @ 1.215-1.220v. If I go anything higher I get instability.

These are the settings I changed in the bios.

AI Overclock Tuner- Manual
BCLK/PEG Freq- 100
Turbo ratio- By all cores
41

Memory Freq 1333mhz
timings- 9-9-9-24 1t


Load-line calibration- High

Cpu voltage- manual mode

Dram voltage- auto (1.5v)

CStates- enabled


I'm hopeing to acheive a 4.5ghz 24/7 OC

This is on a Asus WS Revolution mobo.
May 3, 2011 10:30:04 PM

Have you tried raising the vcore?
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May 3, 2011 10:43:34 PM

The vcore listed in your first post seems too low for a decent Overclock.
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May 3, 2011 10:48:33 PM

Jim_L9 said:
The vcore listed in your first post seems too low for a decent Overclock.



Is it possible you could help me get to a higher OC?

So far I can only get 4.1 with 1.120v (small ffts for 1h 15m) No crashing

I tried 4.5 with 1.280 and its still crashed BSOD within 5 minutes or less. I'm worried about damaging or severly decreasing the life of my hardware. Thats why I need help and reasurance.

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May 3, 2011 11:09:13 PM

I think according to Intel, these chips can do up to 1.52V safely with good cooling. But keeping it below 1.4V for 24/7 OC is a good idea. Try using 1.35V and Ultra high LLC. My 2500K does 4.8ghz @ 1.35V fully stable. Also, I see you have you ram at 1T timing. What ram are you using? Is 1T the specs for it? I know most G.Kill ram uses 2T, and I haven't had much luck trying 1T with it.
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May 3, 2011 11:11:08 PM

The default voltage for Sandy Bridge CPUs is 1.2v. For whatever reason, that guide recommends voltages that are below that. I do not recommend voltages that low.

Keep the voltage below 1.4v and the Prime95 peak core temp below 75ºC and you should be fine to overclock for years.
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May 3, 2011 11:15:07 PM

orangegator said:
I think according to Intel, these chips can do up to 1.52V safely with good cooling. But keeping it below 1.4V for 24/7 OC is a good idea. Try using 1.35V and Ultra high LLC. My 2500K does 4.8ghz @ 1.35V fully stable. Also, I see you have you ram at 1T timing. What ram are you using? Is 1T the specs for it? I know most G.Kill ram uses 2T, and I haven't had much luck trying 1T with it.


http://www.mushkin.com/Memory/Silverline/996770.aspx

http://www.newegg.com/Product/Product.aspx?Item=N82E168...



Not sure if its 1t, I don't even know what that is....
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May 3, 2011 11:20:08 PM

1T or 2T is the Command Rate. It wouldn't affect your CPU overclock, so ignore it for now.

You can increase your CPU voltage up to 1.4v as I said in my last post, so you have some headroom to work with. Just keep the temps below 75ºC and you'll be fine.
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May 3, 2011 11:37:50 PM

so what should I test?

turn the LLC to ultrahigh

1.35v 45x100 and just keep raising the multiplier 1 time every time it passes an hour of small ffts prime 95...
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May 3, 2011 11:54:51 PM

PLL overvoltage helps a lot as well, make sure it is enabled.
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May 3, 2011 11:57:34 PM

So I'll set all of what I stated above plus the PLL OverVoltage to enabled and I'll continue to raise the Multiplier stating at 45 until I get crashing. I'll report back and get more input....
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May 4, 2011 12:06:01 AM

also 1.35v gets me to 4.8ghz. I prefer 1.28 at 4.4ghz though for daily use.
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May 4, 2011 12:12:02 AM

1.28 did not work for me with 4.4ghz, I want everyday use. 4.5-4.X is absolutely fine. I'm testing 1.35 now with 4.5ghz
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May 4, 2011 1:18:33 AM

1 hour of prime 95, no crashing!!! H50 does a good job. I'm going to test 46x multiplier now and keep the same voltage.

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May 4, 2011 2:29:38 AM

Glad it's working better. Looking at your screenshot, you've only got 1.336V at load. Raise the LLC to Ultra High and the voltage at idle and load should be almost the same. You really should only need to enable PLL overvoltage for oc's higher than 4.7Ghz. And as for command rate, since it doesn't explicitly say 2T anywhere, then it's probably 1T. Just keep the setting on "auto" and it should be fine.
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May 4, 2011 2:38:26 AM

orangegator said:
Glad it's working better. Looking at your screenshot, you've only got 1.336V at load. Raise the LLC to Ultra High and the voltage at idle and load should be almost the same. You really should only need to enable PLL overvoltage for oc's higher than 4.7Ghz. And as for command rate, since it doesn't explicitly say 2T anywhere, then it's probably 1T. Just keep the setting on "auto" and it should be fine.



right now its at 4.6 testing and so far its been stable for 40 minutes. I'm going to raise the multi to 47 after an hour of being stable. Then I'm going to be close to happy with that.

my voltage is at 1.336 load, I believe I have it LLC to ultra high.
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May 4, 2011 2:50:23 AM

Oh, ok. I just double checked mine, and I get the same. It dips to 1.336 at load 1.35V bios and llc ultra high. If you really want to test your chip for fully stability, you should test it with LinX w/avx (newest linpack). That will put the maximum stress on it. If it can run 25 passes, then you're good. But it looks like you've got a good chip.
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May 4, 2011 2:55:15 AM

orangegator said:
Oh, ok. I just double checked mine, and I get the same. It dips to 1.336 at load 1.35V bios and llc ultra high. If you really want to test your chip for fully stability, you should test it with LinX w/avx (newest linpack). That will put the maximum stress on it. If it can run 25 passes, then you're good. But it looks like you've got a good chip.


So it seems like I'm getting the exact same results after an hour of prime 95 with 46x @ 1.350v.... What should I try with linx ? 48x with same voltage as I don't want to go over 1.350, I just want to see how far I can get with that vcore.
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May 4, 2011 3:41:47 AM

LinX did not seem to even stress my cpu? I am now trying 4.7ghz@ 1.350v with intel burn test as 4.8ghz BSOD's. I have it set for 25 passes and it seems like the temps are lower than prime95.

4.7ghz is now my target as I do not currently want to raise the vcore any higher.


Any suggestions.....

UPDATE 1: Intel Burn Test SUCCESS (10 passes)

46x100 @ 1.350 v core



STARTING 12+hr prime95 small fft ( if stable I'm going to keep this setting as my 24/7 oc until I get a loop) I'll report back with results...

UPDATE: 9 hours of small FFTs and no crashing..

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May 5, 2011 10:33:17 AM

nice temps, think i should get the 2600k!
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May 5, 2011 2:21:37 PM

Yep, pretty nice. The h50 does a good job for the price.

I did another Intel burn test and passed with stability another 25 passes. Memtest is also good. Thanks for the help everybody.
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May 5, 2011 2:23:14 PM

Best answer selected by benson733.nnnnThanks to all who helped, choose best answer based on the voltage recommendation.
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