CPU OC - Next multiplier requires big jump in voltage

[Tech Wizard]

Hey,

 

Did some overclocking on my brothers CPU (i7 4930k, 6c/12t, 22 nm, Ivy Bridge-E) on his X79-Deluxe motherboard. I will attach a small picture below:

 

 

Tests was done on Intel Burn Test + Prime95, where the red typing is blue screen/instability, and green typing = pass/success. Don't worry about temps, as he's rocking a 280mm push/pull AiO Liquid Cooler.

What I fail to understand is; How come I only need to up the voltage by +0,10V from 4,2GHz to 4,3GHz, but it wants a damn +0,70V from 4,3 to 4,4GHz? 

[stealth80]

basically that's as good as it's gonna get, this generally happens

[Jumper118]

2 minutes ago, Tech Wizard said:

Hey,

 

Did some overclocking on my brothers CPU (i7 4930k, 6c/12t, 22 nm, Ivy Bridge-E) on his X79-Deluxe motherboard. I will attach a small picture below:

 

 

Tests was done on Intel Burn Test + Prime95, where the red typing is blue screen/instability, and green typing = pass/success. Don't worry about temps, as he's rocking a 280mm push/pull AiO Liquid Cooler.

What I fail to understand is; How come I only need to up the voltage by 0,10V from 4,2GHz to 4,3GHz, but it wants a damn +0,70V from 4,3 to 4,4GHz? 

well that chip sucks  4.4ghz is your best bet. you can go upto 1.35v on ivy no problem. 

[Skiiwee29]

Thats 100% normal

[Tech Wizard]

2 minutes ago, stealth80 said:

basically that's as good as it's gonna get, this generally happens

1 minute ago, legacy99 said:

Thats 100% normal

Is there an explination behind why it wants +0,1V from one clock, to +0,7V for the next clock, other than "100 % normals / generally happens"? I'm just interested

1 minute ago, Jumper118 said:

well that chip sucks  4.4ghz is your best bet. you can go upto 1.35v on ivy no problem. 

Thanks for the tip, but the reason for making this post was to learn why it wants +0,1V from one clock, to +0,7V for the next clock

 

[done12many2]

The last multiplier right before the sharp rise in required voltage is the sweet spot for that chip.  That's not to say that it won't work fine at the multiplier just after it, but you'll be pushing a lot more power through that chip for little gained in return.

 

Every chip has a sweet spot where it runs the best and yours happens to be at 4.3.

[Jumper118]

5 minutes ago, Tech Wizard said:

Is there an explination behind why it wants +0,1V from one clock, to +0,7V for the next clock, other than "100 % normals / generally happens"? I'm just interested

Thanks for the tip, but the reason for making this post was to learn why it wants +0,1V from one clock, to +0,7V for the next clock

 

i see what you mean now. did you change anything else? how many times did you test this? seems odd.

[Tech Wizard]

2 minutes ago, Jumper118 said:

i see what you mean now. did you change anything else? how many times did you test this? seems odd.

No, didn't change anything else. Base clock/bus speed (BCLK) was default @ 100.00, meaning I only touched multiplier and voltage.  Tested it several times just to be sure. See @done12many2 comment above. Made some sense at least

[Jumper118]

1 minute ago, Tech Wizard said:

No, didn't change anything else. Base clock/bus speed (BCLK) was default @ 100.00, meaning I only touched multiplier and voltage.  Tested it several times just to be sure. See @done12many2 comment above. Made some sense at least

have you tried the 125 strap? i find quite a few x79 chips work better with the 125 strap. 2/3 of my 3930K were faster with it at the same voltage. 

[Tech Wizard]

6 minutes ago, Jumper118 said:

have you tried the 125 strap? i find quite a few x79 chips work better with the 125 strap. 2/3 of my 3930K were faster with it at the same voltage. 

No, I have never played with BCLK. Do you think I could use my 43x multiplier, with 125 strap on same voltage as my picture above (1.240V)? Also, will I see significant improvements with BCLK OCing? 

[done12many2]

2 minutes ago, Tech Wizard said:

No, I have never played with BCLK. Do you think I could use my 43x multiplier, with 125 strap on same voltage as my picture above (1.240V)? Also, will I see significant improvements with BCLK OCing? 

 

Umm...  Probably not bud.  That would be 5,375 MHz.  haha

[Jumper118]

4 minutes ago, Tech Wizard said:

No, I have never played with BCLK. Do you think I could use my 43x multiplier, with 125 strap on same voltage as my picture above (1.240V)? Also, will I see significant improvements with BCLK OCing? 

yeah you will need to lower the multi on your ram and cpu a lot. it should say how fast it is in the bios. when i was testing i netted 50-150 extra mhz. 

[Tech Wizard]

6 minutes ago, done12many2 said:

 

Umm...  Probably not bud.  That would be 5,375 MHz.  haha

Ayy! Let's burn this chip! I must have missunderstood what Jumper118 said.

5 minutes ago, Jumper118 said:

yeah you will need to lower the multi on your ram and cpu a lot. it should say how fast it is in the bios. when i was testing i netted 50-150 extra mhz. 

What's the difference to lower CPU/RAM multipliers for increasing BCLK frequency, and end up on the same core speed? Wouldn't games prefer higher multipliers with 100 BCLK strap, over let's say multiplier of 32x and 125 strap?

[Jumper118]

7 minutes ago, Tech Wizard said:

Ayy! Let's burn this chip! I must have missunderstood what Jumper118 said.

What's the difference to lower CPU/RAM multipliers for increasing BCLK frequency, and end up on the same core speed? Wouldn't games prefer higher multipliers with 100 BCLK strap, over let's say multiplier of 32x and 125 strap?

the performance clock for clock the same. normally you end up with slightly faster or slower ram and a slightly higher or lower cpu clock, thats all. 

[Tech Wizard]

1 minute ago, Jumper118 said:

the performance clock for clock the same. normally you end up with slightly faster or slower ram and a slightly higher or lower cpu clock, thats all. 

Thanks for the tip, but I think I'll leave my brother's CPU to 100 strap with 43x multiplier @ 1.240V