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Help with First Overclock I5 750

post #1 of 9
Thread Starter 
I cant get my i5 past 3.7ghz and I suspect its because I have left my pll,Vtt and phc all to auto. Can someone plz explain to me what they all do. I want to reach at least 3.8ghz.My Voltage for my cpu is 1.35v, but ill try and lower it some more when I am able to fully understand what everything means.
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post #2 of 9
VTT - uncore voltage. Cache, memory controller. Increased baseclock or memory frequencies will require more VTT voltage. I suggest keeping it under 1.4v at max for long term use. The VTT voltage and the DRAM voltage must remain within .5v of each other.

CPU PLL Voltage - helps sync the CPU Clock with the baseclock and helps maintain a constant core speed. ---- With this voltage it is hit and miss. Sometimes too high can hurt you just as much as too low. I'd suggest starting with 1.80v and go from there.

PCH - P55 Chipset voltage - Heat problems can come into play pretty quick here. Raising it is seldom advantageous. 1.05v should be stock and I'd lock it into that.
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post #3 of 9
Thread Starter 
Quote:
Originally Posted by ~sizzzle~ View Post
VTT - uncore voltage. Cache, memory controller. Increased baseclock or memory frequencies will require more VTT voltage. I suggest keeping it under 1.4v at max for long term use. The VTT voltage and the DRAM voltage must remain within .5v of each other.

CPU PLL Voltage - helps sync the CPU Clock with the baseclock and helps maintain a constant core speed. ---- With this voltage it is hit and miss. Sometimes too high can hurt you just as much as too low. I'd suggest starting with 1.80v and go from there.

PCH - P55 Chipset voltage - Heat problems can come into play pretty quick here. Raising it is seldom advantageous. 1.05v should be stock and I'd lock it into that.
thanks, just to clarify my dran max voltage can only be 1.4 For for long term use. I will add rep when I get home
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vertex 2 60gb and other random hard drives Windows 7 64-bit Corsair hx 750w Coolermaster 690 
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post #4 of 9
Quote:
Originally Posted by IRJASONN View Post
thanks, just to clarify my dran max voltage can only be 1.4 For for long term use. I will add rep when I get home
that doesn't sound right, most DDR3 ram is 1.65v, some is 1.5v. I personally run mine at 1.60v.
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post #5 of 9
VTT keep under 1.4v and within .5v of the Dram voltage Dram voltage is fine at 1.65v if that is where it needs to be but if so keep the VTT above 1.15v.
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post #6 of 9
Thread Starter 
Ok now I get, Thanks + REP
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i5 750 3.8ghz P7P55D-E DELUXE GTX 470 Kingston hyperX 8gb ddr3 
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post #7 of 9
Quote:
Originally Posted by ~sizzzle~ View Post
VTT keep under 1.4v and within .5v of the Dram voltage Dram voltage is fine at 1.65v if that is where it needs to be but if so keep the VTT above 1.15v.
Exactly

OP-shoot for 1.3Vcore and like 1.27Vtt and see how high you can push the BCLK while keeping temps in check and maintaining stability
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post #8 of 9
You must first set your CPU Multiplier to 13, use the voltage of like 1.13v or maybe one lower... (Slightly lower than stock voltage, but not much!)

Then set your BCLK to 200...

Then set your voltage on your IMC...

You have to stabilize your RAM & IMC first...

This is called isolating your BCLK from the rest of your components...

To do this you should set your IMC to somewhere between 1.2875v to 1.33v

If you cannot stabilize your BCLK you will need to take it down some..

You will need to have your RAM Voltage at 1.5 & set your timings appropriately to run 1200 RAM.. Obviously 1200 is not stock, so you should be fine with your 1333 RAM settings, but you may need to loosen the timings up some to get RAM stable.. (You don't want to use 1600 RAM)

Once you have a stable IMC Voltage set, after testing, and your BCLK is stable at 200, if it can go that high, if not you may take it down to 196...

I was able to get 196 stable on my RAM... with an IMC voltage of 1.2875

I couldn't go above 3.5 GHz because of my cooler, temps were too high..

That's not to say you can't but If you can get 4 GHz on Air, that would be a nice feat indeed!

Once your 200 BCLK is stable, then you can start raising your CPU Multipler & Voltage...

This is all about finding the highest BCLK you can stabilize so you can OC your other components..

That is the proper order to do it in mate...
Edited by _GTech - 2/27/11 at 8:43pm
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post #9 of 9
Thread Starter 
Thanks everyone +rep.
First Build
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5 750 3.8ghz P7P55D-E DELUXE GTX 470 Kingston hyperX 8gb ddr3 
Hard DriveOSPowerCase
vertex 2 60gb and other random hard drives Windows 7 64-bit Corsair hx 750w Coolermaster 690 
  hide details  
Reply
First Build
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5 750 3.8ghz P7P55D-E DELUXE GTX 470 Kingston hyperX 8gb ddr3 
Hard DriveOSPowerCase
vertex 2 60gb and other random hard drives Windows 7 64-bit Corsair hx 750w Coolermaster 690 
  hide details  
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