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3930k 4.5ghz H100i temp question

post #1 of 6
Thread Starter 
Hi everyone,

I have read a ton of advice and found questions on this site, and I finally have one to ask myself that seems very specific and I couldn't find an answer anywhere else. I hope this is the right area to post this. Here is my question.

I recently started to overclock, I know some about it but not a lot. I took my 3930k to 4.5 ghz and I am still in the early phase of testing its' stability. My processor seems to be a little tricky and is a power hog. I tried using 1.35 vcore and BSOD after around 20-30 minutes, but I am now using 1.38 and so far with about an hour of testing (not much at all) it is stable. However I am running into a problem.

In prime95 my temps slowly increase as normal and then stabilize for a bit, but then they exponentially increase around 10 degrees for around 20 minutes. Then they go back to lower temps. I tried 4.7 ghz and I was around 76 celsius for awhile, then temps increased overall but some cores went around mid to high 80s out of nowhere. Then they dropped to around 69 to 72 area for a period of time. I then tried 4.5ghz (which I am at now) and I was hovering around 64-70 temps, and then they increased to high 70s to low 80s. Then they dropped down again.

I looked at every solution that I thought would possibly cause this. And this is what I can say it is not. The CPU is not throttling, it was at 4.5ghz the whole time. My H100i fan speeds and water temp were stable the entire period. My ambient temp didn't change even a degree in celsius this entire period.

This occured through prime95 the entire time, so it isn't as if some extraneous variable came about causing a shift in processing power. In theory with prime95 the temps should reach a stable temp and stay there, and only increase over time if the coolant/radiator isn't keeping up (which it should be) or if your ambient temp is increasing. It shouldn't be changing temperatures like that.

Anyone have any idea what could cause this?

(water temps were around 44 celsius. Room temperature was around 24.3 - 24.6 celsius)
post #2 of 6
So really the question is more asking why the temps fluctuate during prime load than the temps themselves....am I understanding that right?

Which version of prime are you using? And what settings are you using within prime?
 
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post #3 of 6
Thread Starter 
Quote:
Originally Posted by deafboy View Post

So really the question is more asking why the temps fluctuate during prime load than the temps themselves....am I understanding that right?

Which version of prime are you using? And what settings are you using within prime?

I am using the most recent version. Using the blend setting for the stress test. Im slightly worried of the temps themselves, but more worried about the fluctuation of increasing around 10 to 15 celsius then cooling down. Could this be the blend settings?
post #4 of 6
Watch what FFT test is running when your temperatures spike. You should see the highest temperatures during the Small FFT tests such as 8k or 16k. The larger FFT test stress the ram more then the CPU so the temps will be lower. The temperature fluctuation is normal.
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post #5 of 6
Yeah, that's pretty normal during blend...
 
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Play Server
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NAS
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CPUMotherboardGraphicsRAM
Intel i7 3930k @4.8-5.2 Asus Rampage IV Black Edition 3x R9-290 Corsair Dominator Platinum 16GB @1866C9 
Hard DriveHard DriveHard DriveCooling
Intel 750 400GB 2x Samsung 840 EVO 500GB (1TB) SanDisk Ultra II 960GB EK Rampage IV BE Water Block 
CoolingCoolingCoolingCooling
2x Swiftech D5 w/ EK Dual Pump Top XSPC EX480, EX360 & 2x Phobya 1080 EK Supremacy EVO CPU Block EK Advanced 250mL Res 
CoolingCoolingCoolingOS
Copper Tubing w/ push fittings 3x EK-FC R9-290X Lamptron FC-5V2 Windows 10 Pro 
MonitorKeyboardPowerCase
Samsung U28D590D 4K Leopold Otaku Corsair AX1200i Silverstone TJ07, heavily modified 
MouseMouse PadAudioAudio
Corsair M65 Corsair MM600 Sennheiser HD595 / HD428 / HD280 Corsair SP2500 
CPUCPUMotherboardRAM
Intel Xeon E5620 Intel Xeon E5620 Dell R710 Mobo Hynix 144GB DDR3 ECC PC3L-10600R 
Hard DriveCaseOther
Intel X25-M G2 80GB Dell 710 2.5" - Google Search Appliance Dell Perc H700 Raid Controller 
CPUCPUMotherboardRAM
Intel Xeon E5-2670 v1 Intel Xeon E5-2670 v1 SuperMicro X9DRL-iF 64GB Kingston ECC (kvr16r11d4/16HA) 
Hard DriveCoolingOSPower
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post #6 of 6
Thread Starter 
Thanks for the help everyone biggrin.gif. Glad it is a normal occurrence then. Now just need to find an answer to this power hungry CPU XD
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