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Need help with CPU offset mode(for voltage control)

post #1 of 11
Thread Starter 
Hello,

So I have my i5 2500k running @ 1600Mhz when idle, and 4800Mhz on load.
The core voltage is 1.340v.

How can I set up offset mode correctly so that when it's on idle speed, the voltage drops down to stock? which is 0.98 I believe.
    
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post #2 of 11
Quote:
Originally Posted by zefs View Post
Hello,

So I have my i5 2500k running @ 1600Mhz when idle, and 4800Mhz on load.
The core voltage is 1.340v.

How can I set up offset mode correctly so that when it's on idle speed, the voltage drops down to stock? which is 0.98 I believe.
My favorite way is to set Load-Line Calibration to Ultra High, and then open Real Temp and click this button to see the VID:




The VID's purpose is to find the Offset by finding the difference between the VID you see and the core voltage that you want. However, be aware that there is a chance you may need to put load on the CPU in order to see your true VID.

The core voltage that you want is the voltage you want to see in CPU-Z under full load.

Also, disable CPU C3 Report and CPU C6 Report as well because this will avoid BSOD's and system lock-ups while idling or during low load. Disabling these two prevents the core voltage from going too low (so, it raises the "floor" just a little bit so that it's not too low).
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post #3 of 11
Thread Starter 
Ok so VID is 1.0107v.

So is that correct?
1.34v - 1.01v = 0.33v

Now I go on bios and set Cpu mode to offset, and where it says auto I type 0.33?
Also, is that + or -
    
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post #4 of 11
1.0107V looks very low to me. Put some load on the CPU while looking at the VID, such as Prime95.

Also, the increments in the UEFI are at 0.005V.
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i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
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Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
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post #5 of 11
Thread Starter 
With intel burn test the VID went up to 1.43 VID.
What now?
    
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post #6 of 11
is that with manual voltage of 1.340 in BIOS?
if so then you need to - the difference between VID during load and the voltage you want.
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post #7 of 11
Thread Starter 
Yes, 1.340v I set that as manual voltage on bios.

So it's 0.090V? Do I set that where it says Auto, on CPU offset mode?
    
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post #8 of 11
If it's like my Gene-z, when you set it to offset mode, it sets that offset relative to what the Auto Vcore would be for that multi. You just have to play with it. So if you got 1.43V with a .33V offset, and you want 1.34V, then set the offset to .24V
    
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post #9 of 11
Quote:
Originally Posted by zefs View Post
Yes, 1.340v I set that as manual voltage on bios.

So it's 0.090V? Do I set that where it says Auto, on CPU offset mode?
yes change auto to manual and then minus and 0.090v and reboot load up prime and check voltage in cpu-z
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Hard DriveOptical DriveOSMonitor
500GB WD Cavair Black, 1TB WD Cavair Green LG Lightscribe DVD Writer, LG Blu-Ray Drive Windows 7 Pro x64 LG 22" lcd monitor (1680x1050) 
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post #10 of 11
Manual voltage makes the voltage the same all the time.
Offset takes the VID and adds/subtracts from it by the amount you set.

Right now I'm at 4.7GHz, high LLC and +0.05 offset which gives me a load VID of 1.3511, and a load Vcore (in CPU-Z) of 1.344-1.360.

Enabling higher LLC will reduce vdroop and allow you to have lower idle voltages because you don't need to raise the offset as much to compensate for vdroop.

You'll have to check the idle VID and subtract the required offset to get whatever idle voltage you want, but you'll also then be lowering the load voltage.
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Windows 7 Home Premium x64 BenQ E2420HD Filco Majestouch 2 Tenkeyless w/ MX blues Seasonic SS-650HT 
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