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i7-2600k Turbo on all cores

post #1 of 6
Thread Starter 
Hello,

Based on my understanding from reading in various places this is how the turbo function works for the 2600k:

3.8Ghz - 1 core
3.7Ghz - 2 cores
3.6Ghz - 3 cores
3.5Ghz - 4 cores

I'm running folding at home and am hoping to get my rig setup for -bigadv units so I was hoping to get some assistance from the experts out there. Please note that I'm decent at computers but am a total noob with overclocking... (sorry)

I have the Asus P8P67 Deluxe mobo with the Coolit Eco R120 cooler. I understand that to achieve 3.8Ghz on all 4 cores I will need to change a setting in AI Tweaker to set turbo to "set by all cores".

Is my understanding of this correct? Also, will this negatively affect the lifespan of my chip?

Also, my objective is to ensure I have decent folding speeds (don't need to be the best, just trying to help where I can) but at the same time not damaging or affecting the longevity of my 2600k.

Thank you kindly for all of your help in advance.

GreenTomato
post #2 of 6
Hi!

It's very simple. You can ignore Turboboost entirely. Disable any features such as EIST (SpeedStep) and C1, any power saving features, but leave HPET on and turn HT off. Set the voltages to 1.2v and set the multiplier to 40. Boot into Windows and run Prime95 for an half an hour. This should pick up any errors, if you even get into Windows at all. If you're chip is good you should be fine. If not, boot into the BIOS and raise the voltage by 0.005 (probably the + on the Numpad) and try Prime again. Keep an eye on temperatures the entire time. 73C is the max safe temperature for these chips*.

I'm running a 2500 @ 4GHz, 1.202v (CPUID)
My friend has a 2500k @4.8GHz, 1.36v (CPUID)

If you think you've found a good overclock, run Prime95 Blend Test for around 16 hours, also some Intel Burn Test (with Linpack SP1 AVX) for 200 runs. If you don't crash, there's no errors and your temperatures are good, then you're ok!

* I think Intel set one core to read around 4-5C hotter than the other cores and one core a little lower, say again 3-4C leaving two cores giving an accurate temperature reading, probably so that the average is slightly higher than the actual and that thermal controls act before the max temp is reached.

EDIT:

Also pop along here and put in your systems specs =D
    
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post #3 of 6
Thread Starter 
Thanks for the reply. I'm hoping to avoid running this type of overclock (at this point in time) and am looking mainly from the turbo standpoint.

What are the pros and cons to the approach you mentioned vs. using the turbo?
post #4 of 6
Hmm, Well for me when I used TurboBoost it set me to only 3.8GHz and wanted a massive 1.34v to do this, whereas I'm running at 4GHz with 1.202v, running at much lower temperatures than the 3.8. The lower voltages means less power consumption, too which should be good for you as a folder wink.gif

If you could get around 4.5-4.8GHz for under or around 1.38v you should do it as the temps should be fine and that should get you some decent PPD. If not a modest OC like mine would still benefit you over using the Turboboost due to less power consumption and higher clocks.
    
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post #5 of 6
Thread Starter 
That`s very useful insight. Thank you.

At first I thought the turbo boost maintains the stock voltage that why I was leaning towards going with it. However, based on what you mentioned, it appears that turbo boost actually increases your voltage in a less efficient manner....

I have two follow up questions:
1) Is there a step by step noob guide that I can follow for i7-2600k to walk me through the steps?
2) You mentioned that HT should be turned off. But for folding, especially for -bigadv units, a minimum of 8 threads are required, so wouldn't that limit my ability to do -bigadv units?

Thank you.
post #6 of 6
I tried to make my first post as step by step as possible for you smile.gif Yes, turning HT off would likely affect that if it is a HT welcoming unit. Very simply, you should enable HT if you want it and overclock just as I mentioned before. The process doesn't change but you may find lower max overclocks. But from the sounds of it you're not after a monster of an OC, so you should be more than ok to use HT in your OCing smile.gif
    
CPUMotherboardGraphicsRAM
Intel i5 2500 @ 4,004GHz (1.202v) Asus P8P67-PRO B3 Leadtek GTX260 65nm 896MB 700|1430|1100 4GB DDR3 Muskin 1686MHz 
Hard DriveOptical DriveOSMonitor
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CPUMotherboardGraphicsRAM
Intel i5 2500 @ 4,004GHz (1.202v) Asus P8P67-PRO B3 Leadtek GTX260 65nm 896MB 700|1430|1100 4GB DDR3 Muskin 1686MHz 
Hard DriveOptical DriveOSMonitor
2xWD CB 250GB, 2x SG 320GB, 1xSS F1 1TB Pioneer DVD-RW Windows 7 Professional 64bit Samsung 2032BW 20" 1680x1050 16:10 
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