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Can't get 2600k passed 4.7ghz - Page 2

post #11 of 27
Quote:
Originally Posted by Indulgence;14446562 
if you're going pass 4.7ghz, you need to enable the PLL overvoltage. Also, try setting your LLC to level 1 (or to what level in which the voltage will stay close to the vcore you set in the bios, under load).

But yeah, invest on some decent cooler first as getting pass 4.7ghz requires a hefty amount of voltage..

Not true. Do not use LLC level1 it is too much. (too flat)
Especially at higher clock/voltage.
LLC is there to prevent the unwanted voltage spike damaging your CPU on load.

Also PLL overvoltage acts different on either each CPU or mobo.
I do not need it till 5.2GHz.
Also some of people reported it is frequency dependent.
Means you might need it at 4.9 but not needed at 5.0 and so on.
You have to try it out and see what your set up likes.

Also you should test your RAM. Have you tried it with 1600 or 1333?
to start OC higher clock with 1866 is not desirable.
Since more ram, faster ram you have, it is harder to make higher clock stable.
Is your VTT(VCCIO) high enough?
Dram voltage high enough?
Edited by Tunagoblin - 8/3/11 at 6:52am
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post #12 of 27
Thread Starter 
I have tried my ram at different speeds (setting XMP then bumping memory down to 1600, setting it to auto 1066). The voltage for auto is 1.5 and XMP sets it to 1.65. I've tried changing my other voltages as follows:
CPU PLL: 1.9V, VCCSA: 1.1V, VCCIO: 1.106V

I've tried setting them one by one but never all of them at the same time.

I just tried taking out all my extra PCIe stuff and hard drives with no difference in results.

I'll try turning PLL overvoltage off and see what kind of results I get out of that.
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post #13 of 27
Thread Starter 
So I tried turning PLL overvoltage off but it didn't have any effect.

After that I set my ram to auto (1066) and tried to find a lower clock speed. I found out that I can do 4.5ghz at 1.35v 10 mins IBT stable, and 4.6ghz at 1.41v 10 mins IBT stable.

The voltage curve seems to be a little out of whack from 4.5ghz to 4.7ghz:
1.35v -> 1.41 -> 1.45

I've also noticed that going from 4.5 to 4.7 doesn't have any effect on my other voltages (i.e. VCCIO). Should it be changing itself automatically?
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post #14 of 27
Quote:
Originally Posted by Frongo;14452947 
I have tried my ram at different speeds (setting XMP then bumping memory down to 1600, setting it to auto 1066). The voltage for auto is 1.5 and XMP sets it to 1.65. I've tried changing my other voltages as follows:
CPU PLL: 1.9V, VCCSA: 1.1V, VCCIO: 1.106V

I've tried setting them one by one but never all of them at the same time.

I just tried taking out all my extra PCIe stuff and hard drives with no difference in results.

I'll try turning PLL overvoltage off and see what kind of results I get out of that.

Do not change any voltages that you don't know.
VCCSA is not related to OC or stability. It is only for system agent voltage witch should not be changed from stock.
Also CPU PLL is too high for that clock.
Some people can run it as low as 1.709 at 5Ghz.
Just turning up random voltages won't make it sable.
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post #15 of 27
Quote:
Originally Posted by Frongo;14447084 
Based on what I've seen in this forum and pretty much everywhere else on the internet, my voltages are ridiculously high for this clock speed. They're too high for my 24/7 clock so I'm probably going to have to bump it down to x46 or maybe even x45.

I have tried 0 LLC as some people have suggested elsewhere, but %75 gives me pretty close to 1.45 under load.

I want to focus on my other hardware (ie remove some of the 3 hard drives I have plugged in and remove all PCIe cards except video card) before I just give up and call this a bad chip.

Besides that are there any other suggestions?

Not all chips are the same.

Your chip needs more vcore for that clock. And it is a myth that ALL sandy bridge cpus can hit 5ghz. Some cannot. Most of them can however, it is not always under reasonable voltage. Your chip for example will probably need in excess of 1.6v to hit 5ghz.

crank up your vcore, or settle for a lower clock. The first 2600k I had I was forced to settle with 4.6ghz as anything higher required too much vcore. My second chip was a touch better, and my third even better.


Quote:
Originally Posted by Tunagoblin;14447558 
Not true. Do not use LLC level1 it is too much. (too flat)
Especially at higher clock/voltage.
LLC is there to prevent the unwanted voltage spike damaging your CPU on load.

Also PLL overvoltage acts different on either each CPU or mobo.
I do not need it till 5.2GHz.
Also some of people reported it is frequency dependent.
Means you might need it at 4.9 but not needed at 5.0 and so on.
You have to try it out and see what your set up likes.

Also you should test your RAM. Have you tried it with 1600 or 1333?
to start OC higher clock with 1866 is not desirable.
Since more ram, faster ram you have, it is harder to make higher clock stable.
Is your VTT(VCCIO) high enough?
Dram voltage high enough?

LLC is not there to prevent spikes. It is there to prevent voltage droop under load. And you need LLC enabled to overclock your cpu at the higher frequencies. I recommend 50-75% llc for 4.7ghz.
Some people use 100% and keep there voltage in the bios lower. Either way your load voltage will end up the same for any give clock that is stable.
Edited by AliceInChains - 8/4/11 at 9:15am
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post #16 of 27
Quote:
Originally Posted by AliceInChains;14461430 
LLC is not there to prevent spikes. It is there to prevent voltage droop under load. And you need LLC enabled to overclock your cpu at the higher frequencies. I recommend 50-75% llc for 4.7ghz.
Some people use 100% and keep there voltage in the bios lower. Either way your load voltage will end up the same for any give clock that is stable.
In a way LLC does prevent the load spikes.
Since LLC is there for compensating the vdroop amount.
Thus it gives you more head room (or right amount of headroom) when the load spike occur.
So you mean by setting LLC to level1 (extreme, flat, no vdroop) it is not protecting the CPU from the spike.
That is correct.

more on LLC...
http://www.masterslair.com/364/vdroop-and-load-line-calibration-is-vdroop-really-bad/
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post #17 of 27
Thread Starter 
Alright, so I think I'm going to just throw in the towel at 4.6ghz 1.41v. My temps in IBT are below 80 which I'm completely okay with.

I didn't want to give up on it since I hadn't seen anyone else with a chip that maxed out at 4.6/4.7.

Thanks for the tips.
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post #18 of 27
Quote:
Originally Posted by Frongo;14465382 
Alright, so I think I'm going to just throw in the towel at 4.6ghz 1.41v. My temps in IBT are below 80 which I'm completely okay with.

I didn't want to give up on it since I hadn't seen anyone else with a chip that maxed out at 4.6/4.7.

Thanks for the tips.

Trust me there are sooo many in the same situation.

Post all your bios settings and we can have a look at it biggrin.gif
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post #19 of 27
Thread Starter 
My bios (or everything that seems relevant):

bios1.jpg
bios2.jpg
bios3.jpg
bios4.jpg
bios5.jpg
bios6.jpg

Let me know if anything else is required.

And thank you for the encouragement smilingsmiley.gif
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post #20 of 27
I'm at 4.8G @ 1.4 with a similar setup (and it's pretty much the norm as far as average vcore for 4.8 on a 2600K). Frankly, it appears all your settings are geared for a > 5.0Ghz OC, take a step back and work up to all those extreme settings. ;-)

Here's what I would change on your setup:

AI overclock tuner: manual (you'll need to set all mem timings, freq and VDIMM manually)
Internal PLL: disabled (I've had 3 diff. 2600Ks, none needed this until 4.9 or 5.0)
CPU Manual voltage: 1.4 (for starters, may go lower)
VCore PWM Mode: T.Probe (you aren't going to need extreme for 4.7)
Vcore Switching Freq: Manual (this will create a new box right under)
VRM Fixed Frequency Mode: 350
VCore Over-Current Protection: 120%
Intel Adaptive Thermal Monitor: Enabled
EIST: Enabled
CPU C1E: Auto
CPU C3 Report: Auto
CPU C6 Report: Auto

I also have VCore Phase Control set to optimized so I can use offset voltage and idle at 1.0V. It's a little more difficult to dial in your OC using that method, but I think long term it is worth it.
Edited by ugotd8 - 8/6/11 at 3:25pm
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