i5 6600k @ 4.6ghz 1.25v

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zLukez

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Oct 31, 2015
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In the BIOS, I placed it at 1.35v, but when I run prime95 and cpu-z it shows 1.25v with occasional spikes up to 1.26v. Temperature is fine at about 78c. When I place in the BIOS 1.25v it freezes. Is there someway I can make the voltage during load the same as the one I set in the BIOS. Also planning on going to 4.9ghz :) On another note, how long will this cpu last physically at this voltage, temps, etc. ?
 
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synphul
zLukez, it's because you've 'hit the wall' with your cpu. Every cpu is different individually and voltage isn't as simple as a constant ratio of say .05v vcore to every 100mhz increase. It will appear that way for awhile until you reach the point where the cpu begins requiring much higher core voltage to achieve the next multiplier. When that happens your chip is physically running out of headroom to go further. 4.6ghz is still a nice oc and outside of bragging rights the additional 100-200mhz won't make much difference.

The faster your cpu is clocked, the less difference the mhz make due to the percentages. A 100mhz increase on a 200mhz cpu is a 50% increase. A 100mhz increase on a 4.6ghz (4600mhz) cpu is 2% increase. I'd drop back to...
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Ecky

Ecky

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Feb 3, 2013
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Nobody knows how long a Skylake CPU will last, yet, but Intel CPUs have historically been very hardy, and it's not unreasonable to expect that unless you really abuse one badly, it will long outlive its usefulness. General consensus is that going above 1.4v (actual, not in-bios) is a bad idea on Skylake if you want longevity, but this isn't based on anything published by Intel.

Worth noting: 4.9ghz is only 6% faster than 4.6ghz, but you may very well double the amount of power your CPU consumes in order to get that last 300mhz. This is how my 22nm Ivy Bridge i5 behaves, in terms of power consumption, as I increase clockspeed:

mMBmP2A.png


^ This is why the i5 6600K is a 95w TDP CPU, and the i5 6600, which is only clocked slightly lower, is a 65w TDP CPU.
 
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zLukez

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Oct 31, 2015
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Tried pushing it to 4.7ghz but it took 1.36v and the temp got to like 94c on prime95. I don't think that's a good idea, and idk why it takes .11v to raise 0.1ghz
 
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synphul

synphul

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Mar 11, 2011
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zLukez, it's because you've 'hit the wall' with your cpu. Every cpu is different individually and voltage isn't as simple as a constant ratio of say .05v vcore to every 100mhz increase. It will appear that way for awhile until you reach the point where the cpu begins requiring much higher core voltage to achieve the next multiplier. When that happens your chip is physically running out of headroom to go further. 4.6ghz is still a nice oc and outside of bragging rights the additional 100-200mhz won't make much difference.

The faster your cpu is clocked, the less difference the mhz make due to the percentages. A 100mhz increase on a 200mhz cpu is a 50% increase. A 100mhz increase on a 4.6ghz (4600mhz) cpu is 2% increase. I'd drop back to 4.6ghz if it were my chip, that seems to be the sweet spot. .11v isn't worth 100mhz in my opinion even if the vcore and temps are still considered 'safe'.
 
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zLukez

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Oct 31, 2015
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I'll drop to 4.6ghz, thanks for your advice. I also want my cpu to last for about 5 years, so 4.6ghz is probably a better idea. Turns out my 4.7ghz takes as much voltage as others out there. 1.37 not 1.36. 1.26v for 4.6ghz. I need to test it longer.
 
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