Crazy Fluctuations in Core Temps (I Think)

[Claimer9]

It's kinda hard to know where to start here but i'll try to make it as breif as possible.

I recently built a new computer with the following components:

i7-4790k

-->STOCK INTEL COOLER<--

GTX970

16GB RAM

Z97S MOBO

RM650 PSU

1TB SSHD

NZXT Phantom 410 Case

Windows 7

 

After getting everything up running and playing ~20 minutes into Metro:Last Light w/ maxed settings my computer abruptly shut off. No hang, no BSOD, just off. I immediately suspect heat as the culprit. After a few minutes I turn my computer back on (successfully thank god) and run the burn test that I should have done in the first place (w/ prime95 iirc). 10 second in, all 4 cores were at 85-100C prompting me to panic and stop the test. I did this a few more times with different programs that net me the same result. I decide that the stock cooler is clearly not enough and order an aftermarket replacement, doing only light tasks in the mean time.

Skip ahead a few weeks and my replacement for the stock Intel CPU cooler has finally arrived at my door. (BeQuiet Dark Rock 3) After swapping it in I ran a system stability test with AIDA64. The temps were slightly better but still a toasty 70-90C. This is when I noticed a very odd pattern in the graph displayed by AIDA64 (or rather had it pointed out to me by my more hardware-savvy friend who was with me) Core temps were making huge temperature leaps between updates sometimes up to 25 degrees difference (ie 92C -> 67C -> 83C) I had noticed similar behavior with the stock cooler before but hadn't thought much of it until it was pointed out to me as abnormal.

So I guess my question is as follows: Are such temperature fluctuations abnormal as my friend says and if so what could be causing it? faulty sensor perhaps?

Oh and here's a screenshot of the AIDA64 results:

 

Thank you so much in advance for any help you can provide.

 

p.s. Even if these temps were stable would they even be normal for 100% load w/ my cooler?

 

EDIT: Bolded the name of my new cpu cooler for the people who missed it.

[AlwaysFSX]

Your CPU should not be getting that hot. Did you clean off the old thermal paste when you changed the cooler?

[Guest Johnny5g]

get another cooler!

[Guest Johnny5g]

Your CPU should not be getting that hot. Did you clean off the old thermal paste when you changed the cooler?

he is using the stock cooler.

[Chugle]

Well Intel's hot heatsinks are pretty shit so...

[AlwaysFSX]

(BeQuiet Dark Rock 3)

he is using the stock cooler.

Well Intel's hot heatsinks are pretty shit so...

Reading be too hard.

[Claimer9]

As I said in the post I am no longer using the stock Intel cooler and I wasn't using it when i ran the test shown in the screenshot. And yes I cleaned off and replaced the old thermal compound.

[Tedster]

As I said in the post I am no longer using the stock Intel cooler and I wasn't using it when i ran the test shown in the screenshot. And yes I cleaned off and replaced the old thermal compound.

Remount and try again.

[Claimer9]

Remount and try again.

I'm willing to try this but I want to examine some other avenues first, the way it's situated that's kind of a 2 man job and I don't have access to a second person atm. Could that even cause the fluctuations? (ignoring the high temps for now)

[Tedster]

I'm willing to try this but I want to examine some other avenues first, the way it's situated that's kind of a 2 man job and I don't have access to a second person atm. Could that even cause the fluctuations? (ignoring the high temps for now)

You shouldn't be getting fluctuations in temperatures unless the fan's ramping up and down - you're right.

Watch the voltage on the CPU when it fluctuates - does that fluctuate similarly?

[Claimer9]

You shouldn't be getting fluctuations in temperatures unless the fan's ramping up and down - you're right.

Watch the voltage on the CPU when it fluctuates - does that fluctuate similarly?

I'm really out of my element here regarding voltages so I'll just post another screenshot w/ the test run again instead showing voltages.