i5 6600k overclocking prime95 vs intel extreme tuning utility also have a limp core

L0stChild

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Mar 8, 2016
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So I've had the 6600k for a few days and been messing around with it to find its potential.

normally on my 6400 it would tell me from the get-go on boot up if the overclock is no good.
right now i havent had any problems booting up.
ive gone to 4.8ghz but no tests or anything.. just was playing around to see if it actually would boot. i didnt want to run tests on it yet because i knew the temperatures were already high at 4.6-4.7 and didnt want a crispy 6600k just yet.

im finding prime95 failing on last core within a few mins at 4.5ghz
and at 4.6-4.7 it pretty much fails in seconds.
ive played around with the voltage and gotten up to 1.35vcore, with that i was peaking at 92c-95c
that point i just shut it down.

what im basically looking for is to confirm that the chip is able to run past 4.5 but i have a core thats limped. Ive done some searching and it seems like a common event to have so what is the solution if there is?
drop the multiplier on that core to 45 (x100) or until it stops crapping out?
or run as is and see if the other cores fail?
or... run different types of tests?

ive been using intel extreme tuning for bench and tests also and it seems more forgiving than prime95. but i have crashed before and bumped up my vcore and it became stable so i know its able to determine the threshold.


mild pc bench:
http://www.userbenchmark.com/UserRun/2270716
hwinfo on bench:http://imgur.com/a/GcCWz

 

CompuTronix

Intel Master
Moderator
L0stChild,

Do NOT use versions of Prime95 later than 26.6 on Core i 2nd through 6th Generation i3, i5 or i7 CPU's which all have AVX (Advanced Vector Extension) instruction sets. Recent versions of Prime95 such as 28.9 run AVX code on the CPU's Floating Point Unit (FPU) which causes unrealistic temperatures up to 20C higher. The FPU test in the utility AIDA64 shows similar results.

Please download Prime95 version 26.6 - http://windows-downloads-center.blogspot.com/2011/04/prime95-266.html

Run only Small FFT’s for 10 minutes.

Use Core Temp to measure your temperatures - http://www.alcpu.com/CoreTemp

Your Core temperatures will test up to 20C lower with v26.6, and you may find that your single Core issue is no longer present.

Also, you might want to read this Sticky at the top of the CPU's Forum: Intel Temperature Guide - http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html

CT :sol:
 

L0stChild

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Mar 8, 2016
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thanks!
I appreciate it!