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First Attempt at OC'ing a I5 750 Lynnfield and I'm not getting the results I should be. Advice Needed

post #1 of 13
Thread Starter 
Hey guys, I've decided to push some more power out of my I5 750 as a last ditch attempt to put off buying a new computer. I replaced the stock OEM cpu fan with a Cool Master Hyper 212 cooler. I used Arctic MX-4 thermal paste for the new cooler. Everything is seated right and running. Based on these guides:

http://www.tomshardware.com/reviews/core-i5-750-overclock,2438.html
http://www.tomshardware.com/forum/256144-29-1156-core-overclocking-guide

My setup is the following:
  • I5 750
  • Gigabyte P55A-UD4
  • 12GB DDR3 RAM
  • GTX 780 Ti
  • Cool Master 212 Hyper CPU Fan
  • Arctic MX4 Thermal Paste


I've been able to get it to 3.15GHz (170 BCLK/18x CPU Ratio) at stable temps. (avg 35C on idle, 50C on max load). My settings are the following: Load-Line Calibration: Disabled, Vcore= 1.264V (CPU-Z idle), QPI/Vtt/IMC= 1.149V, PCH= 1.10V, PLL= 1.85V, RAM= 1.5V, Power saving states disabled

The problem starts when I try to push it up to 3.2GHz, I will get constant restarts and BSOD. I up the voltage and it doesn't help. It seems that 3.15GHz is the happy spot, but all the guides tell me that anything under 3.8GHz should be easy. I'm nowhere near it. I've gone as far as upping the voltages to the following: Vcore= 1.40, Vtt= 1.155, Vram= 1.575, PLL= 1.89 with PCH=1.10

And up the frequency to 3.2GHz and I still get BSOD. Any other advice on what I should do or should I stay at 3.15GHz?
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post #2 of 13
I had an i5-750 and though I can't remember specifics right now I remember it being good overclocker.

you say (12GB) DDR3 Ram but is that 4 x 3gb? what speed (specs)?

if you hit the link in my signature on how to put your rig in your sig it may help us help you out!!

Welcome to OCN
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post #3 of 13
Have you adjusted the memory multiplier to prevent the memory from being pushed too far out of spec. The baseclock and memory are linked so a memory multiplier may need to be adjusted.

You may have to hit something like control + F1 in the bios to enable all options under MIT on many of those boards as well.
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post #4 of 13
Thread Starter 
Quote:
Originally Posted by mtbiker033 View Post

I had an i5-750 and though I can't remember specifics right now I remember it being good overclocker.

you say (12GB) DDR3 Ram but is that 4 x 3gb? what speed (specs)?

if you hit the link in my signature on how to put your rig in your sig it may help us help you out!!

Welcome to OCN

Its 2x 4GB and 2x 2GB

The 4GB sticks are DDR3-1600. I will get back on the speeds for 2GB sticks
Quote:
Originally Posted by Nukemaster View Post

Have you adjusted the memory multiplier to prevent the memory from being pushed too far out of spec. The baseclock and memory are linked so a memory multiplier may need to be adjusted.

You may have to hit something like control + F1 in the bios to enable all options under MIT on many of those boards as well.

I have not adjusted the memory multiplier. I left it on stock settings so it may be on auto. I will check. Is this something that has to be manually adjusted?

I followed this guide:
http://www.tomshardware.com/forum/256144-29-1156-core-overclocking-guide

In the frequency settings, I only adjusted the CPU frequency. IN the guide it says to adjust two other parameters - QPI Clock multiplier/ratio and Memory multiplier/ratio. How do I know what to put for these values?
Edited by forevergone - 4/24/17 at 9:35am
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post #5 of 13
Quote:
Originally Posted by forevergone View Post

Its 2x 4GB and 2x 2GB

The 4GB sticks are DDR3-1600. I will get back on the speeds for 2GB sticks

ok this is why I asked, as 12GB sounded strange. honestly I would go with the (2) same sticks at 4GB each. doing unusual ram combinations is going to affect you. Also Nukemaster brought up a good point and that's to make sure you are running your ram at rated speed with the memory multi.
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post #6 of 13
Thread Starter 
Quote:
Originally Posted by Nukemaster View Post

Have you adjusted the memory multiplier to prevent the memory from being pushed too far out of spec. The baseclock and memory are linked so a memory multiplier may need to be adjusted.

You may have to hit something like control + F1 in the bios to enable all options under MIT on many of those boards as well.
Quote:
Originally Posted by mtbiker033 View Post

ok this is why I asked, as 12GB sounded strange. honestly I would go with the (2) same sticks at 4GB each. doing unusual ram combinations is going to affect you. Also Nukemaster brought up a good point and that's to make sure you are running your ram at rated speed with the memory multi.

I will run the 2 4GB sticks for now and see how it runs. I have KHX1600C9D3B1K2/8GX - what should I set as my multiplier? I'm a bit confused. Is my memory frequency for each stick or in total?

If i run 2 different combination of sticks (i.e. 2 different speeds), what would I enter in the memory multiplier?
Edited by forevergone - 4/24/17 at 9:53am
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post #7 of 13
Quote:
Originally Posted by forevergone View Post


I will run the 2 4GB sticks for now and see how it runs. I will also update my memory multiplier to reflect the proper speeds.

If i run 2 different combination of sticks (i.e. 2 different speeds), what would I enter in the memory multiplier?

your 8GB you said was 1600mhz, just make sure in bios whatever settings you are using your ram is no higher than 1600mhz, I'm not familiar with the bios of your motherboard but it should be pretty straightforward!
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post #8 of 13
When using multiple sets of sticks. Use the slowest sticks settings.

Also note that the cpu officially only supports upto 1333 memory.

You may also have better luck with a higher multiplier. 20 should be the top for non turbo(160 x 20 would give 3.2).

In the end, now all chips will make the same clock speeds.
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post #9 of 13
how did you make out?
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post #10 of 13
Thread Starter 
Quote:
Originally Posted by mtbiker033 View Post

how did you make out?

I changed the memory multiplier to 8x to bring the frequency back down and voila, it worked! Y'all are awesome. Thanks for the help.

I'm stress testing my settings at 3.8GHz right now and am very happy! Based on the various resources, it seems that 3.8GHz is where diminishing returns begins. My settings right now are:

Load-Line Calibration: Disabled, Vcore= 1.296V (CPU-Z idle), QPI/Vtt/IMC= 1.149V, PCH= 1.10V, PLL= 1.85V, RAM= 1.5V, Power saving states disabled and holding steady so far. Idle temps hover around the mid 30C and on 100% load, it stabilizes around 60C. Max CPU usage is 232W, which is a bit high. My QPI link speed is 3420GHz.

It looks pretty stable at the moment, knock on wood. I'd like to push for 4GHz but is the extra power consumption worth it? The VCore that people end up using ends up being around 1.4V.
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