i7-4790k runs at 90-100°C without programs running (except Core Temp)

Ggspikey · Jul 19, 2015

For the past couple of months I have noticed that my computer has been running very slow and I haven't been able to play games and I can just about browse the Internet, but I can't watch YouTube videos. I used to use my computer to play game whilst browsing the Internet/watching YouTube videos and my computer would run perfectly. I have tried many things to get my PC to run faster and yesterday I even re-installed Windows 8.1, however nothing helped significantly. It wasn't until today that I realised it was my CPU that has been slowing down my PC, at least that is what I think is slowing down my PC. So, today I cleaned out my PC, replaced the thermal compound on my CPU, fitted a new case fan and tidied up the cables. However, my CPU is still running at 90-100°C, does anyone know how to fix this problem or what could be causing it?

p_nut_uk · Jul 19, 2015

Gonna ask a silly question first, is the fan spinning?
Is it overclocked?
If so what Voltages and speed are you using/getting?
What cooler are you using?

Ggspikey · Jul 19, 2015

p_nut_uk :

Yes, the fan is spinning.
No, it's not overclocked.
I am using the default cooler, but it has worked for almost a year so I don't understand why it has suddenly just started running at such a high temperature.

p_nut_uk · Jul 19, 2015

Check the BIOS to see what voltages are running just to be sure.
Can you explain the air flow in your case? Is it cooler with the side panel off?

corndog1836 · Jul 19, 2015

Thats really high man. What voltage in bios

corndog1836 · Jul 19, 2015

And is fan spinning fast or just turning slowly, do you have dust in th heatsink?

Ggspikey · Jul 19, 2015

p_nut_uk :

How do I check the voltage?
Air comes in through the bottom and out through the top and back, I have tried to get the wires out of the way. However, I have a mini-itx case so there isn't much I can do. It still runs at 90-100°C with the side panel off, because that is where the motherboard is, the other side panel has the power button and USB ports on it, it is a BitFenix prodigy case.

Ggspikey · Jul 19, 2015

corndog1836 :

The fan is spinning fast and I cleaned the heatsink earlier when I cleaned my PC and replaced the thermal compound.

p_nut_uk · Jul 19, 2015

Go into the BIOS, (usually DEL on startup) and look for the pc health/diagnostic/overclocking screen and look for VCORE Voltage or similar.

Are all the push pins on the stock cooler secure? I know how fiddly they can be

Ggspikey · Jul 19, 2015

p_nut_uk :

The voltage is 1.466V. I believe all the push pins are secure, my PC was running slow before I removed the CPU fan so I assume that won't be the cause.

p_nut_uk · Jul 19, 2015

Unless I'm wrong it should be 1.25, can you manually adjust it in the BIOS to be 1.25? If that voltage is accurate that is possible the reason for your higher temps.

ccampy · Jul 19, 2015

Woah 1.4v? That is actually a dangerous voltage if its correct I'd reset your BIOS/CMOS immediately and then recheck

alpha27 · Jul 19, 2015

haha 1.5v is ok if u using liquid nitrogen or h20 cooling, should be around 1 v to 1.2 v, get that voltage down or its gonna fry
if temp hasn't droped reseat cpu thermalpaste with thin layer, update ur bios by lan con, reset bios to fail safe to defaults,
someone might have haxed ur bios and tried to fry ur cpu me thinks.

Ggspikey · Jul 19, 2015

p_nut_uk :

How do I lower the voltage?

p_nut_uk · Jul 19, 2015

You could reset the bios, there should be an option, safe defaults or similar.

corndog1836 · Jul 19, 2015

alpha27 :

1.5 is good as a short term voltage ONLY... I can use 1.5v I get 4.9mhz(not rock solid) with a Noctua DH-15(see rig in sig) BUT BUT BUT I will most likely degrade the chip very very quickly shortening its lifespan.

These are decent temps and voltages for i7 4790k(see rig in sig) with turbo disabled

4.4ghz == 1.26562v for 24/7 useage 35 Celsius = idle 48 Celsius max = Prime95 Blended test
4.7ghz == 1.37812v for GAMING ONLY 35 Celsius = idle 57 Celsius max = Prime95 Blended test

corndog1836 · Jul 19, 2015

what motherboard do you have I will tell you how to lower your voltage...

Ggspikey · Jul 19, 2015

I have the Gigabyte Z97N WiFi motherboard I believe.

corndog1836 · Jul 19, 2015

Ggspikey :

you need to be SURE!!!!!

Ggspikey · Jul 19, 2015

My voltage is down to 1.172V now.

Ggspikey · Jul 19, 2015

At the bottom it says F7 for optimised defaults, should I click that? Or is it load defaults? Also my computer keeps shutting down.

Ggspikey · Jul 19, 2015

After lowering the voltage, when I tried to start up my PC the boot failed. So I loaded the optimised defaults and rebooted. Then when I logged in and opened Core Temp my PC blue screened.

corndog1836 · Jul 19, 2015

Ggspikey :

yes. load defaults.....

Ggspikey · Jul 19, 2015

corndog1836 :

When I loaded defaults a few things changed, one of which was the voltage, it is now at 0.903V.

corndog1836 · Jul 19, 2015

Ggspikey :

cause it an AUTO feature.. it will raise and lower clock and voltage when needed....

i7-4790k runs at 90-100°C without programs running (except Core Temp)

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