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i5-2500K OC Questions

post #1 of 17
Thread Starter 
Hello All!

I am fairly new to overclocking, and just have a few questions. First of all, I achieved a stable overclock of 4.5GHz using the settings listed below, but I was wondering if there's another way to set the voltages either using offset or manual mode. The reason is, I followed several guides to set these settings, and am not sure if they are the best for overclocking. Also, when the system idles, the frequency and voltage never decreases. I know that it's supposed to be 1.6GHz @ 1.0v when idling, but my computer is always 4.5GHz @ 1.336v. Another thing, when playing games and running other CPU-intensive software, the voltage decreases to 1.296v, and sometimes causes a BSOD. The only BSOD error code I get is 0x124, which means too little Vcore. Can someone help me out and let me know what settings I have that are incorrect/not optimized for the overclock I have applied? I have a good aftermarket air cooler, so the temps are 24C when idle and ~50C when under load.

Thanks all!

Hardware:
ASUS P8P67 PRO (Rev. 3.0)
Core i5-2500K
Corsair Vengeance RAM (16GB, 4x4, 9-9-9-24 2T)
GTX 580

UEFI BIOS Settings:
Ai Tweaker
Ai Overclock Tuner: Manual
BLCK/PCIE Frequency: 100.0
Turbo Ratio: By All Cores
By All Cores: 45
Internal PLL Voltage: Enabled
Memory Frequency: DDR3-1600MHz
DRAM Timing Control: use the rated timings
EPU Power Saving MODE: Disabled

Ai Tweaker\ CPU Power Management >
CPU Ratio: Auto
Enhanced Intel SpeedStep Technology: Enabled
Turbo Mode: Enabled
Long Duration Power Limit: Auto
Long Duration Maintained: Auto
Short Duration Power Limit: Auto
Additional Turbo Voltage: Auto
Primary Plane Current Limit: Auto

Ai Tweaker (in the DIGI+ VRM section)
Load-Line Calibration: Auto
VRM Frequency: Manual -> 350
VRM Spread Spectrum: N/A
Phase Control: Extreme
Duty Control: Extreme
CPU Current Capability: 110%
CPU Voltage: Offset
CPU Offset Sign: -
CPU Offset Voltage: 0.015
DRAM Voltage: 1.50
VCCIO Voltage: Auto
CPU PLL Voltage: 1.8
PCH Voltage: Auto
CPU Spread Spectrum: Auto

Advanced\ CPU Configuration >
CPU Ratio: 45
Intel Adaptive Thermal Monitor: Enabled
Active Processor Cores: All
Limit CPUID Maximum: Disabled
Execute Disable Bit: Enabled
Intel Virtualization Technology: Disabled
Enhanced Intel SpeedStep Technology: Enabled
Turbo Mode: Enabled
CPU C1E: Auto
CPU C3 Report: Auto
CPU C6 Report: Auto
post #2 of 17
Bumping ancient thread because I too would like some of this info. My 2500k is at all stock settings except 40 for multiplier instead of 33, and I have good cooling as well (Idles 29-31C), load 45-50C. I would like to push to 4.5 but not at the expensive of possible instability and 0x124s!
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post #3 of 17
Try setting the LLC from auto to ultra high or extreme +.0115 should be enough voltage for 4.5 on a higher LLC setting. LLC will help eliminate the voltage drop to the CPU.

Edit: LLC stands for Load Line Calibration, also turn off C3 and C6 power states in the CPU configuration they cause instability when using offset voltage. You can enable C1E to help keep the processor from drawing more power and making more heat while idling.

Edit 2: Turn off spread spectrum too.
Edited by Aesir - 1/11/12 at 8:32am
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post #4 of 17
Will do when I get home from work. Thanks.
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post #5 of 17
Quote:
Originally Posted by KraziKarl View Post

Will do when I get home from work. Thanks.

Alright but the LLC on your Asrock motherboard I think the equivalent to extreme is level 1 and 5 is lowest. I think 4.5 GHz can be had somewhere ~1.35 or below, but my processor has never seen less than 4.9 GHz unless it's idling. Offset is a bit tricky because on ultra high mine needs +.08 but on extreme it's way less, so you have to check to see where you land on the vcore in cpu-z. Just take it slow, maybe 3 voltage steps at a time and with offset .0xx the x's are what you should add .9 volts would get you into the 2+ volt range.
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post #6 of 17
foruman, you can set the following, leave everything else at auto and see if its good to go:
turn off turbo
llc high
vrm freq auto
vrm spread spec enable/auto
phase control optimized optimized
cpu offset +
offset voltage .015
pll auto

if you bsod/restart/other crashing: turn off c3 and c6 report before you add more vcore

follow munaim's guide. it works.
you can get 4.5 with nothing but a multi change and a small bump in vcore offset under normal circumstances
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post #7 of 17
Thread Starter 
Quote:
Originally Posted by Aesir View Post

Try setting the LLC from auto to ultra high or extreme +.0115 should be enough voltage for 4.5 on a higher LLC setting. LLC will help eliminate the voltage drop to the CPU.
Edit: LLC stands for Load Line Calibration, also turn off C3 and C6 power states in the CPU configuration they cause instability when using offset voltage. You can enable C1E to help keep the processor from drawing more power and making more heat while idling.
Edit 2: Turn off spread spectrum too.

OK, I will try these settings. Do you mean +0.015v for the offset voltage? Because I can only do increments of 0.005v on my motherboard.

Also, when the system idles, the frequency and voltage never decreases. I know that it's supposed to be 1.6GHz @ 1.0v when idling, but my computer is always 4.5GHz @ 1.336v. Is there some setting I need to change to enable this, or does it nor matter? Does it make a big difference if it downclocks and lowers voltage or not?
Quote:
Originally Posted by pc-illiterate View Post

foruman, you can set the following, leave everything else at auto and see if its good to go:
turn off turbo
llc high
vrm freq auto
vrm spread spec enable/auto
phase control optimized optimized
cpu offset +
offset voltage .015
pll auto
if you bsod/restart/other crashing: turn off c3 and c6 report before you add more vcore
follow munaim's guide. it works.
you can get 4.5 with nothing but a multi change and a small bump in vcore offset under normal circumstances

Hmm, I don't see these settings in the guides posts from other overclocking community forums that I've been reading. They all recommend some sort of set VRM frequency, LLC of Ultra High, and Extreme phase control. Also, the default CPU PLL voltage is 1.8v; setting it to auto will sometimes make it go under to 1.7v occasionally.
Edited by Foruman - 1/11/12 at 2:39pm
post #8 of 17
Quote:
Originally Posted by Foruman View Post

OK, I will try these settings. Do you mean +0.015v for the offset voltage? Because I can only do increments of 0.005v on my motherboard.
Also, when the system idles, the frequency and voltage never decreases. I know that it's supposed to be 1.6GHz @ 1.0v when idling, but my computer is always 4.5GHz @ 1.336v. Is there some setting I need to change to enable this, or does it nor matter? Does it make a big difference if it downclocks and lowers voltage or not?
Hmm, I don't see these settings in the guides posts from other overclocking community forums that I've been reading. They all recommend some sort of set VRM frequency, LLC of Ultra High, and Extreme phase control. Also, the default CPU PLL voltage is 1.8v; setting it to auto will sometimes make it go under to 1.7v occasionally.

C1E will lower the voltage at idle and speedstep will lower the multiplier at idle both need to be turned on to get 1.6 GHz and ~1v at idle. But yes go up at increments of + .005 two or three at a time till you get mostly stable then you can add or remove as necessary. PLL voltage shouldn't make a whole lot of difference, but the C1E and Speedstep just make it so your CPU might last longer and use less power. VRM frequency should help power stability and LLC should keep the voltage from dropping when the CPU goes under load. If you ever end up going higher than 4.5 GHz you may need to enable internal PLL overvoltage. It allows some people to be able to even boot at higher multipliers but it seems to be for 4.8 GHz and above from what I have seen.
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post #9 of 17
Thread Starter 
Quote:
Originally Posted by Aesir View Post

C1E will lower the voltage at idle and speedstep will lower the multiplier at idle both need to be turned on to get 1.6 GHz and ~1v at idle. But yes go up at increments of + .005 two or three at a time till you get mostly stable then you can add or remove as necessary. PLL voltage shouldn't make a whole lot of difference, but the C1E and Speedstep just make it so your CPU might last longer and use less power. VRM frequency should help power stability and LLC should keep the voltage from dropping when the CPU goes under load. If you ever end up going higher than 4.5 GHz you may need to enable internal PLL overvoltage. It allows some people to be able to even boot at higher multipliers but it seems to be for 4.8 GHz and above from what I have seen.

OK, so I have enabled these settings, and indeed now the CPU is going to the right voltage and frequency when idling. Just a quick question: this constant changing of frequencies and voltage for when the CPU is idle and under load won't damage the CPU, right? Since Intel designed it this way...sorry, I'm fairly new to OCing, and don't want to break anything I can't afford another one of.
post #10 of 17
Quote:
Originally Posted by Foruman View Post

OK, so I have enabled these settings, and indeed now the CPU is going to the right voltage and frequency when idling. Just a quick question: this constant changing of frequencies and voltage for when the CPU is idle and under load won't damage the CPU, right? Since Intel designed it this way...sorry, I'm fairly new to OCing, and don't want to break anything I can't afford another one of.

Correct, the voltage changes to prevent surges of voltage from damaging your cpu, when overclocking we 'counter' this protection by reducing the amount of variation in the voltage swings.

Also bsod 124 does not necessarily mean not enough cpu vcore, it can mean memory is unstable, other settings such as PLL voltage are unstable, or can be down to power saving features such as c1e, c3/c6 etc.

Check out the guide in my sig for more info
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