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Problems overclocking i5 750

post #1 of 4
Thread Starter 
Well, I have what may or may not be a simple question to answer. I've included what I felt to be all relevant information about my hardware in my signature, let me know if I left anything out.

Here's my dilemma; I'm trying to overclock my i5 750. I've got it up to 3.4GHz stable at present. My RAM is stock 1333MHz, but for some reason my system always runs it at 1066MHz. I've got the motherboard setting RAM timings and FSB multiplier automatically for the moment. As soon as I kick it up to 3.6GHz however, I start getting errors in OCCT and prime95. My temps never get above 75-80C, so I know that it's not getting too toasty. Here are the values I have presently:

Core speed: 3411.5 MHz
Multiplier: x 20.0
Base clock: 170.6 MHz
RAM Multiplier: 3
RAM Frequency: 1023MHz
RAM Timings: 9-9-9-21
VDroop: High

Voltages:
CPU Vcore: 1.32
CPU VTT: 1.138
CPU PLL: 1.850
DRAM: 1.600


Do those look reasonable for 3.4GHz? Also, what might I be doing wrong when moving up to 3.6? I've tried bumping voltages (core all the way to 1.39) but I still can't seem to hit 3.6 stable.

Thanks for any advice!
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post #2 of 4
Try reducing vcore and vtt...if your mem is running under its official clock, no reason to raise the voltages. i'm running at 3.8Ghz with 1.18V.
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post #3 of 4
Thread Starter 
Thanks vsmith; I'll try that out later when I'm back at my PC.
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post #4 of 4
Too high of a Vcore imo. I do not remember my Vcore at this time, but it is slightly over 1.2V. I would suggest this:
1) Set your RAM multiplier to the lowest setting - just to ensure RAM is not causing unstability.
2) Put all your voltages to stock. Lower your multiplier to 13. Raised your BCLK to 200. More likely you will bsod or error. Now, increase your Vtt by one notch from the default/stock value and test each time until you are stable. If you want to get a jump start, put your Vtt to 1.2V. Make sure to run at least 3 iterations of IBT for quick stability test. Once you are stable at 200 BCLK (with your multiplier at 13), you reached your stable Vtt.
3) Now, lower your BCLK to 133Mhz, increase your multiplier to 20, then start raising BCLK by 50Mhz. Each time test for stability with 3 iterations of IBT. If unstable, raise Vcore by one notch. Rinse and repeat. This way, the only variable is Vcore as you have already set a stable Vtt in step #2. Once you reach stable 4Ghz (or 3.6, 3.8, whatever your goal is) do some comprehensive test with Prime95, etc.
4) Now go back to your RAM and try the next multiplier to see if your settings are stable with a higher RAM multiplier. Remember, RAM is the first one to be sacrificed for a stable overclock. My RAM is 1600, but for my overclock, I had to set it as a 1066 RAM. Currently, it runs at about 1500 Mhz with my overclock.

Hope this helps.
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Wife's bane
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i5-3570K @ 4.5 Ghz Gigabyte Z77 UD3H HIS R9-290 8 GB Samsung Wonder RAM 
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Crucial SSD for OS Samsung Spinpoint F3 Asus XSPC water block, 360 radiator, and 720 reservo... 
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GPU cooling - XSPC Razer full GPU blocks Win 7 Home Premium Asus PB278Q 2560 X 1440p ISP Logitech G15 
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NZXT Hale90 V2 NZXT Switch 810 Logitech G500 Steelseries QcK 
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Optical out to Sony receiver; Deftech Monitor 3... 
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