Safe voltage for 4.3 Ghz OC on i5 2500k

specs:
half 912 case
coolermaster n520 cpu cooler
p8p67 board
4 x 4 kingston hyperx RAM

what is a safe and stable voltage to run the i5 at for a 4.3 GHz OC i am currently running at 1.215 volts

thanks for the help
19 answers Last reply
More about safe voltage 2500k
  1. looks good. there are already A LOT of 2500k threads here. if you read some it would benefit you and your knowledge in the future. i highly suggest starting with:
    http://www.tomshardware.com/forum/265056-29-2600k-2500k-overclocking-guide

    btw, from what i have seen, you probably don't want to get any higher in volts unless you start looking towards 4.5 Ghz . .
  2. thank you, but if i was to go to 4.5 what voltage would u suggest
  3. You shouldn't have to mess with voltage at all for 4.5ghz, I think. If you don't hit it, though, try 1.28v and then 1.3v. I've heard that 4.7ghz generally takes around 1.35v, but that might wear the chip out too quickly for anyone's taste.
  4. rob12 said:
    specs:
    half 912 case
    coolermaster n520 cpu cooler
    p8p67 board
    4 x 4 kingston hyperx RAM

    what is a safe and stable voltage to run the i5 at for a 4.3 GHz OC i am currently running at 1.215 volts

    thanks for the help


    You are still safe Vcore voltage. Mine is i5 2500K overclocked at 4.7 GHZ Vcore is 1.40 V
    1.40 V is still lower to the maximum Vcore Voltage of 1.520 V stated by Intel.
  5. 1.52 is the volt when the cpu will burn out not the safe voltage for longevity. Tom's uses 1.35 for longevity.
  6. k1114 said:
    1.52 is the volt when the cpu will burn out not the safe voltage for longevity. Tom's uses 1.35 for longevity.



    Don't worry I bought an Intel CPU overclocking warranty for only $25.00
  7. Whaa? where did you get that Warranty? I wouldnt mind putting my i5 2500k to the max with that warranty! XD

    Mine is set to 4.5 ghz with 1.3v, runs real smooth.
  8. If you don't mess with the voltage much more than that, you shouldn't have to worry about burning it at all. OCing by itself, changing the multiplier, won't break a CPU.
  9. buklao0222 said:
    Whaa? where did you get that Warranty? I wouldnt mind putting my i5 2500k to the max with that warranty! XD

    Mine is set to 4.5 ghz with 1.3v, runs real smooth.



    Go to Intel.com
  10. another question in relation to origanal post.......

    ive been running prime 95 just to check myy stability however the Vcore is going to 1.336 when i have it set to 1.215. why is this happening??
  11. The BIOS says 1.215?
  12. ya when i look in bios its set for 1.215 but when running prime 95 it jumps to 1.336
  13. rob12 said:
    ya when i look in bios its set for 1.215 but when running prime 95 it jumps to 1.336


    do you have speedstep enabled in your BIOS?
  14. There is no setting for NB, sandy is not phenom. What is your llc? It should be at default which is medium. What other settings have you changed?

    This is the best guide for asus sb owners. http://hardforum.com/showthread.php?t=1578110

    It is not speedstep, that doesn't kick in til you're in windows and would be much lower, ~.95v.
  15. My only experience is with my 965 xD
  16. Geez, I envy everyone's i5-2500k cpus. Mine is not 45x stable (I actually can't achieve it no matter what I do). I didn't get the luck of the draw... :p

    The most I can push out of mine is 43x with an average vcore of 1.293v. Stable using P95 Blend for about 15 hours now with no errors. But notice vcore did spike as high as 1.536v for a very brief moment. I'm going to see if this is rock solid 24 hours stable with P95 Blend (or at least see how long it remains stable).

    Mind you, I won't have mine on 24/7. Maybe at most 48-72 hours straight, but that's about it.

    Overall, vcore for your 43x is looking really good. Very close to stock voltage. As for me, I'm not that lucky...
  17. It should never spike that high, whatever vcore you set will at most change +/- .1, even with llc on extreme. It could be an incorrect reading, it happens, but since you can't get to 43, there may be other issues. More info could help.
  18. Hi k1114,

    Here are screenshots of:

    BIOS home:


    BIOS settings:


    RAM timings:


    CPU Power Management:


    CPU Config:


    With these settings I'm 4.3Ghz rock solid stable with P95 Blend for 24+ hours. My previous 4.3Ghz OC using the previous BIOS only lasted ~10 hours before system froze and required a hard shut down.

    P95 Blend still running after 24 hours:


    P95 Blend stopped after 24 hours:


    I'm a novice OC'er and I did try pushing it to 4.5Ghz, but every attempt I made always resulted in P95 rounding error or BSOD code 124. Increasing vcore didn't help with stability and even playing with DIMM voltage didn't help either (ranging from 1.55 to 1.60625v - rated RAM is 1.6v). Always got an error or BSOD. Memtest86+ came back no errors at rated timings and lower 1.55v (ran over night 8+ hours). Then I heard about this 'wall' which is what I think is happening here with 4.5Ghz. I could be wrong. Anything you can suggest?
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