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The GPU has a stock quiet mode ... fans do not start till it warms up
 
 What "performance monitor" are you looking at ? your post is not clear
 
1) turn Off Fast Boot in BIOS ... so your MB properly "sees" the new hardware
 
2) Use DDU to uninstall any leftover AMD  drivers .. use safe mode
 
3) download all software ... & scan downloads
 
4) go offline, then turn Off your security software & all background software ... then load your software
 
5) Reboot, or hold the shift Key before you use the shutdown command, hold shift until PC is Off .. this clears W10 kernel
 
6) Make sure your security software is ON again, now connect to your network
 
7) Adjust W10 to performance mode or Optomized
 
8) Adjust Nvidia Control Panel to Performance .... you have to download this separately now days

Are you running at 1080 p resolution ?... or ....

DENNYCR4NE
1080 p

 
Well , there's your answer.   Most reviews when the 30xx series cards came out , showed they are made for  2k & 4k resolutions and that you really barely see anything at 1080p & even in some cases worse performance then the last gen cards.  ( 20xx, 1660, etc )  - when stuck at 1080p
 

TRUE- you should at least see about the same performance generally overall  - NOT 15 fps.
 
I would UNinstall geFarce EXp , it is a  notoriously garbage program
 - then do a fresh install of the nvidia drivers after dumping that ...
+ technically your 600 W psu is really not up to the task. I believe even bare minimum for that card is a solid 650 W unit .  (  I wouldn't use anything less than Gold rated 750 W myself )

It is important for you to get some reliable stats so that you can properly debug.  Install MSI Afterburner and run through some gaming, then exit and check out the performance graphs.  Report back with a pic showing your
- GPU Core Clock
- GPU load
- GPU %Pwr or Power in Watts
- Memory Clocks
- Memory load
- GPU Core temp
- % Fan speeds, or RPM
 
Which driver are you running?
Have you checked performance in more than one game or benchmark?
 

DENNYCR4NE
 I'm fine on PSU, not sure why you'd think 600W gold isn't enough for the card, every reviewer says it's fine.

No it isn't. 
Bare minimum EVGA suggests is a 650 W for your card ...& if you read thru these forums you will see these new 30xx series cards are more power hungry than previous gens and have very high transient power spikes that are taking out psu units much higher than the recommended wattage.
    I suggest you get a bare minimum of 750 W  ( preferable 850 W )  in Gold rated or better.
( Platinum / Titanium)

Problem with PSU recommendations by total wattage is that you have no idea what the real power or current requirements are for the GPU.  If companies recommended total 12V rail capacity, it would be better.
 
For instance, SF600 Gold has 50A available to 12V, working out to 600W.  Run of the mill cheap 650W may actually have less power and current available on the 12V, one random example I looked at had 48.75A which works out to 585W.
 
I doubt the 3600 is drawing all that much 12V unless it is OC'd to degradation level.  40A would be a generous estimate for total 12V I imagine.  If getting high transient, probably about as likely to hit OCP and power off rather than low performance.

If drivers were installed cleanly, and all trace of AMD gone, then I might first try running it at reference clocks to see if performance is improved (ie Debug Mode in Nvidia CP).  If that gains performance, the factory OC is unstable.
 
But if you can't monitor the GPU properly, it sounds like drivers are somehow borked.  You may need to install the latest AMD chipset drivers if you updated to latest bios and have not done that already.
 
You may also need to try setting PCIe to Gen 3 in bios and see if that improves performance.