Computer case fans speeding up and slowing down, rubber burning smell

Wooohah

Commendable
Oct 2, 2016
19
0
1,510
I'm a bit worried right now and I would appreciate any help I can get.
Last night after about a 45 minute session of battlefield 4. I closed Battlefield 4, and normally the case fans would slow down after running on load.
But this time the fans slowed down and sped back up for 5 seconds, slowed down and sped back up, and that went on for a few minutes until I decided to restart.
Out of the top fans of the case I could smell a slight rubber smell.

I was checking speedfan and MSI afterburner, all the temperatures looked fine to me.
I'm currently not 100% certain which fans were speeding up and slowing down.
I don't think I have any of my fans set on a curve except for my GPU fans. The GPU fans were showing at 30% via MSI afterburner.

When I was doing a benchmark later on it showed as being fine, but the second time I did the benchmark about 15 minutes later the computer randomly restarted during the first 5 seconds of the benchmark.

I was asking on some facebook forums and some members told me to check the capacitors on the motherboard for splits or bulges. The capacitors and the motherboard looked fine.

The computer is running ok as of right now, im using it for simple tasks, im not gaming on it anymore. Anyone have any idea?
My graphics card has been having a bit of an issue with micro stutter in browser videos and freezes in game (where the usage goes to 50% or 0% from 100 and the power usage also drops for a split second). Is this possibly related? The benchmark was showing my GPU was underclocking itself but i don't think a GPU can do that?

I've heard many people say its likely the power supply, but it COULD also be the motherboard.
anyone think its the motherboard? How can I make sure?

My specs:
i5 6600k
Zotac GTX 970
16GB Gskill Ram @ 2133mhz
AS Rock H170M Pro 4
Rosewill 700W PSU (I know this ones garbage, i have a EVGA 750W G2 coming in)

Again any helps appreciated! Im a bit of a novice so this has me a bit spooked.
Thanks!
 

Wooohah

Commendable
Oct 2, 2016
19
0
1,510
Fan controller like MSI afterburner?

I have a fan curve for my GPU using afterburner, other than that nothing. But the temps for my GPU was showing at around 30C at that time, which should set the fan at 30%
 

Pentium4User

Honorable
Jun 17, 2016
411
0
11,160
here wait until the new power supply comes because it maybe the power supply because I know the rose will 700 watt ones are poorly made so it probably the mosfets or a resistor on the pcb that burning or getting too hot when the power supply under load.