High temps, what's ideal voltage for this i7 6700k?


Feb 24, 2010
EDIT: I replaced the fan with the NH-D15. Switched CPU voltage back to Auto (1.234v). Currently encoding a 1hr 1080p video file; the temps are now a consistent 66±5C @ 80-95% CPU load, core voltage sits around 1.360v (according to CPU-Z). Definitely seems like 'auto' feeds too many volts imo, but the temps seem good and I'm fine with it. I get the feeling it should be 5-10C lower under load on average - but it's a slightly warm day (32C) as I test this.


So I noticed that whenever I'm recording gameplay, or encoding video footage, the temps would shoot up to 90-100C and performance would become extremely sluggish. Tried reapplying thermal paste, but observed no change. Tried disabling the "Turbo mode" in BIOS, but no change.

CPU voltage was originally set to auto, and displayed 1.234v (94-100C temps @ 70-90% CPU load)

lowered it to manual 1.125v, which would yield (60-80C temps @ 70-90% CPU load), good enough... but then PC would restart itself within 5-15 minutes under load.

Currently using 1.175v, which is giving (75-93C @ 78-95% CPU load), mostly jumps between 73-88C. A bit too high for my liking, but at least it's neither shutting down nor sitting in the 93-98C range. The VID fluctuates between 1.2716v and 1.3477v under load.

I'm not sure how I should configure it. CPU also says 4000MHz in the bios, but shows as 4218 - core temp / CPU-Z: http://i.imgur.com/hx1RfJg.jpg

I'm using:
- ASUS VIII Ranger Mobo
- 1500W Silverstone strider PSU
- Silverstone NT07-115X CPU fan
- Silverstone Raven 4 PC case -> http://media.bestofmicro.com/silverstone-raven-4,W-6-340710-13.jpg
(Damn, I didn't realize how much of a hard-on I had for Silverstone, lol).

I'd appreciate any help, I'm not all that accustomed to messing around in the BIOS. I'd prefer to underclock slightly if gives a noticable drop in temps.

CPU-Z report:
Processors Information

Processor 1 ID = 0
Number of cores 4 (max 4)
Number of threads 8 (max 8)
Name Intel Core i7 6700K
Codename Skylake
Specification Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz
Package (platform ID) Socket 1151 LGA (0x1)
Extended CPUID 6.5E
Core Stepping R0
Technology 14 nm
TDP Limit 95.0 Watts
Tjmax 100.0 °C
Core Speed 4215.4 MHz
Multiplier x Bus Speed 42.0 x 100.4 MHz
Stock frequency 4000 MHz
Max frequency 4200 MHz
Instructions sets MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, EM64T, VT-x, AES, AVX, AVX2, FMA3, TSX
L1 Data cache 4 x 32 KBytes, 8-way set associative, 64-byte line size
L1 Instruction cache 4 x 32 KBytes, 8-way set associative, 64-byte line size
L2 cache 4 x 256 KBytes, 4-way set associative, 64-byte line size
L3 cache 8 MBytes, 16-way set associative, 64-byte line size
Max CPUID level 00000016h
Max CPUID ext. level 80000008h
Cache descriptor Level 1, D, 32 KB, 2 thread(s)
Cache descriptor Level 1, I, 32 KB, 2 thread(s)
Cache descriptor Level 2, U, 256 KB, 2 thread(s)
Cache descriptor Level 3, U, 8 MB, 16 thread(s)
FID/VID Control yes

Turbo Mode supported, enabled
Max non-turbo ratio 40x
Max turbo ratio 42x
Max efficiency ratio 8x
O/C bins unlimited
Ratio 1 core 42x
Ratio 2 cores 42x
Ratio 3 cores 42x
Ratio 4 cores 42x
IA Voltage Mode PCU adaptive
IA Voltage Offset 0 mV
GT Voltage Mode PCU adaptive
GT Voltage Offset 0 mV
LLC/Ring Voltage Mode PCU adaptive
LLC/Ring Voltage Offset 0 mV
Agent Voltage Mode PCU adaptive
Agent Voltage Offset 0 mV

Temperature 0 86 degC (186 degF) (Core #0)
Temperature 1 88 degC (190 degF) (Core #1)
Temperature 2 82 degC (179 degF) (Core #2)
Temperature 3 84 degC (183 degF) (Core #3)
Temperature 4 86 degC (186 degF) (Package)
Voltage 0 1.28 Volts (VID)
Voltage 1 +0.00 Volts (IA Offset)
Voltage 2 +0.00 Volts (GT Offset)
Voltage 3 +0.00 Volts (LLC/Ring Offset)
Voltage 4 +0.00 Volts (System Agent Offset)
Power 0 69.17 W (Package)
Power 1 57.99 W (IA Cores)
Power 2 n.a. (GT)
Power 3 11.18 W (Uncore)
Power 4 2.38 W (DRAM)
Clock Speed 0 4215.37 MHz (Core #0)
Clock Speed 1 4215.37 MHz (Core #1)
Clock Speed 2 4215.37 MHz (Core #2)
Clock Speed 3 4215.37 MHz (Core #3)


Nov 7, 2012
Well your temps are really high, even in the danger zone.

I don't known the concrete cpu fan but the things i could read mark ir as the problem

The NT07-115X is a 65w TDP fan and you are using a CPU of 90w TDP, you are really short on cooling power.

You need to underclock and undervolt the CPU to get a 60w TDP max cpu (will cripple the performance) or replace the cooler for a 90-100w one.


Jul 24, 2016
At stock speeds you shouldn't be anywhere near that temps.

Get a Cryorig H7 or a Scythe Mugen 4/5/Max. They're less than 40 bucks usually and they keep the CPU under 65°C under load.


Feb 24, 2010

Can't believe I glossed over that when I was picking components. I must've just saw the 3600rpm and grabbed it at the last minute "yep, good enough!"

I'll grab a Noctua NH-D15 and see how it goes, thanks guys :)


Jul 24, 2016
the NH-D15 is a huge waste of money for a 6700k imo and will max the space capacity of your case but knock yourself out...


Feb 24, 2010

I looked at a few graphs, and the NH-D15 seems to run slightly cooler and a fair amount quieter than the majority of the competition? (15dB quieter on this one incredibly vague chart). Noise level is of more concern to me than a few degrees, but considering I get a fair amount of 34-44C days here during the hotter months, I guess forking out a little extra couldn't hurt.

I was considering going liquid, but that just seems like more messing around, and apparently can be noticeably louder than CPU fans?

He's sensitive about his size, don't be a meanie! D:


Jul 24, 2016
by all means the NH-D15 is maybe the best air cooler out there.
from my personal experience I can tell you, I got an i7-6700k and it's cooled by a Scythe Mugen 4.
not the most silent cooler in the pack, but fairly quiet.
loudest part in my computer in idle is my WD Black HDD
but I got a sound dampened case.

personally, I have a hard time justifying a 80$ cooler for a 6700k when the difference to a cooler half that price is not too big
but by all means the Noctua is excellent

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