Newly upgraded PC having negative fps spikes at regular intervals

[ws2475]

9600k @ stock
1080 G1 Gaming @stock
Kraken X62
Z390 Aorus Pro Wifi
Corsair Vengeance Pro 16GB DDR4 3000MHz
Samsung 750 EVO 500GB
Corsair 750i

Will try and condense a rough list of what I've tried/noticed.

CPU, MOBO, and RAM all brand new.

Negative spikes also can happen during regular desktop use, much more prevalent in games.

Temps are perfectly fine, CPU between 25-50c, GPU between 50-70c, doubt thermal throttling although both CPU and GPU hit 100% +/-

Swapped in my 970 to rule out GPU hardware fault, negative spikes still present.

Pretty sure I ruled out Gsync being the issue, turned it off, negative spikes persisted.

FPS (with both GPUs) is very stable in every game, the only anomalies are the negative spikes, usually lasting half a second to 2 seconds.

PSU seems to be delivering necessary power to components, 12v through 12v rail, although only one 6-pin cable is connected to MOBO as my PSU doesn't have an extra 4-pin CPU cable. Was told this is only necessary for extreme overclocking. 750W should be more than enough for the build.

Ran memtest, RAM perfectly healthy.

SSD healthy.

I'm sure I left some things out but any help would be greatly appreciated.

 

[Grobe]

That is a very interresting problem - because of the scope of possible reasons:

Those are eiter : You travel faster than light, or you travel back in time (small steps only) - or you use a crappy software that calculate wrong.
What of those three possibilities are more likely?

 

[ws2475]

That is a very interresting problem - because of the scope of possible reasons:

Those are eiter : You travel faster than light, or you travel back in time (small steps only) - or you use a crappy software that calculate wrong.
What of those three possibilities are more likely?

I use 5 different programs to reference GPU and CPU data, including the BIOS, wouldn't call any of them crappy.

 

[Grobe]

upload some screenshots of your programs that repports this.

To be honest I think you're reffering to "fps drops", notation of fps (pr sec) can never have negative values.