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Overclocking i7-2600k

post #1 of 11
Thread Starter 
I have ASUS P8P67 motherboard, 12 GB RAM and Intel i7-2600k processor which is currently running at 3.40 GHz, and I would like to overclock it to about 4.2 GHz, but I'm kinda new to overclocking, so I don't know what to do. Can you explain to me what should I change in BIOS to do it? Thanks.
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Sabijac
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post #2 of 11
Heres a good place to start:

http://www.overclock.net/t/908782/sandy-bridge-overclocking-guide-ocn-members-only

Also, not sure why you have 12 GB of ram. You should be using dual channel, meaning you are only using 2 slots or 4, not 3.
post #3 of 11
Thread Starter 
I went to BIOS, set turbo multiplier to 43x, and the other thing to 100. That's all I changed. Then I booted the system, started SpeedFan to check temperatures and CPU-Z to check core specs.

After that I ran Intel Burn Test on standard stress level 10 times. The clock of the processor increased from steady 1.6 to 4.3 GHz and core temperatures started to rise (maxed at 91'C). After 254 secs the burn test was succesfully completed. The average time for one output was 19 secs, with the speed ranging from 45.5 - 47 GFlops.
Then I ran it on very high stress level, it took 225 seconds for only one packet, with the speed of 34 GFlops, after which I stopped it, because it was taking too long. The temperatures this time were lower (86'C max).

One thing I found curious about this is that the temperatures went down from almost 90' to about 65'C in just one second after the test was finished/stopped.

Did I overclock it properly, and do I need to change anything else? The speed of 4.3 GHz is enough, so I have no need to overclock it any further for now.

EDIT: Just to note, when I ran the test, I didn't close any of the background programs that I never close (Microsoft Security Essentials, nVidia Control Panel, Winamp, Steam, and a few others), so that I could see if it was stable even with all of them running.
Edited by veljaaa - 3/1/12 at 9:46am
Sabijac
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Sabijac
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post #4 of 11
I would read through that guide more. Usually, all you have to change is your vcore and multiplier, but there are other things you may need to play with, like LLC. Your specs are not filled out, so I would assume you are using the Intel stock cooling fan. If this is the case, I would ditch that, and purchase a third party cooler. This will do a much better job cooling your CPU.

The temperatures drop once the stress test is done because there is no longer a load on the CPU, meaning its not doing as much work, so the temps will drop back down.
post #5 of 11
are you using the stock air cooler? if so i would be really hesitant about overclocking too much. You really want to keep IBT or other load temps under 70C if possible. Some people will say it can be a little higher but you don't want it up at 95 C for very long
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ShadowForge
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post #6 of 11
Thread Starter 
I just changed the multiplier, everything else is set to auto (and looks like it's ok). I am using the stock fan. What other specs do you need exactly? I gave you the name of my motherboard and processor in the first comment.
I understand that the temperatures drop, but 30°C in one second seems a bit to much. Also, are those temperatures I had on the test too high?
Sabijac
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Sabijac
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post #7 of 11
I would not let the motherboard auto select vcore. The 3 settings you will likely need to play with are multiplier, vcore, and llc. LLC controls something called vdroop, which should be talked about in that article. If you are using a stock cooler, I would not recommend you overclock. The first thing I would do is replace the stock fan with a third party cooler like the Hyper 212+. Jumping 30 degrees when you put your CPU under 100% load doesnt sound too crazy if you are using your stock fan. It also could be attributed to the vcore if your motherboard is automatically selecting what it thinks is necessary, which usually is much higher than what you really need. One way to tell the multiplier and vcore is to download CPU-Z and watch its readings when you put your CPU under load (IBT, Prime95, etc).
post #8 of 11
Thread Starter 
The Core Voltage goes from 0.984 to 1.296 V when under pressure. According to the article you linked, I think that's OK.
Sabijac
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Sabijac
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post #9 of 11
Quote:
Originally Posted by veljaaa View Post

The Core Voltage goes from 0.984 to 1.296 V when under pressure. According to the article you linked, I think that's OK.

It's definately in the safe zone, but its possible that less vcore is needed to keep 4.3ghz stable. Less vcore = less heat. The other thing that I do not like about auto is it allows the motherboard to give as much vcore as it sees fit. I don't think it would happen, but it could adjust that higher if it wanted to. I would prefer to enter that value in myself. I like to use the offset feature so I can pick a value that it allows to adjust the vcore by. This allows the vcore to drop when its not running at 4.3ghz. I havent seen you address it, but I would still replace that cooler. The temps you are getting are not desirable.
post #10 of 11
Thread Starter 
I've seen offset feature in BIOS, but I didn't want to mess with that. What numbers should I type in those fields? Since it goes from 0.984 to 1.300, should I put one of those numbers, then set the offset to about +- 0.300?
Also, I'm definitely going to replace the cooler soon.
Sabijac
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Hard DriveHard DriveOptical DriveCooling
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Sabijac
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CPUMotherboardGraphicsRAM
Core i7-2600k ASUS P8P67 DELUXE Gainward GeForce GTX 590 Kingston HyperX 16 GB 
Hard DriveHard DriveOptical DriveCooling
Kingston HyperX SSD 120GB Seagate 1TB SATA3 LG DVD-RW Writer Cooler Master Hyper 212 EVO 
OSMonitorKeyboardPower
Windows 7 Ultimate Samsung SyncMaster SA350 Logitech Illuminated Keyboard Chieftec APS-1000C 1000W 
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