I have an NZXT SWITCH 810 that is bottom mount for the PSU
 
Own the 1300 G2 and im building my rig should I place the fan facing 
 
^ towards GPU aka top of case
 
down so the fan faces the bottom of the case which is placed on top of my wooden desk
 
ive screwed it in already with the fan facing down towards the dust filter
but before finishing the build and plugging in the cables id like to know which way to run it
 
thanks also the GPU is a 1080 ACX version so i believe that exhausts its heat towards the PSU
if this is the truth then I believe i should have the psu fan help ''suck'' the gpu heat out of the case

Only difference i can think of is if facing up will contribute to air being exhausted from the case. Which is fine.
If you are trying to maintain positive pressure though just add this fan to the equation. 

i am leaning towards reversing the fan for it to help exhaust the 1080 acx heat aswell

I would set them top fans a exhaust unless they are Push/Pull on a Radiator.
What type of CPU Cooler are you using?
 

Yes  PSU as Exhaust as well as the first fan next to the PSU.

As your case has adequate ventilation the PSU fan should face down.
 
If your case sits close to the surface it sits on; then longer legs or a small stand/ spacer giving 1/2 inch clearance would be prudent.
 
If the case was solid on the bottom, the fan would need to face up.

The PSU heat will be lowest with outside air sucked through the bottom of the case as long as the case is above the desk enough for it to breath.
 
 
If more air flows into the case because of fan placement, your good to go.  Excess pressure will be forced out of the case openings and through the GPU also.
 
ACX blows Most of the heat into the case; some of the air /heat does exit out the back of the case, especially as fan goes 50% and up.

i originaly had fan down removed it and placed it up so it will help suck gpu heat out aswell...
 
so now you both are saying thats not the right way???

dvelope
i originaly had fan down removed it and placed it up so it will help suck gpu heat out aswell...
 
so now you both are saying thats not the right way???

No I said "Go on what Cool GTX tells you." Nothing More, as Cool GTX states above you will need to test it.
Remember that this is an Open Forum and not EVGA Support Employees we all have our ways we are only passing on how we do things. 

so im having some issues build is completly stock settings and every piece of hardware is brand new.
 
the computer constantly restarts itself randomly (so far ive only noticed it browsing chrome)
 
everytime it reboots i check my event viewer and the ONLY critical code it has is 
 
41 = Kernal Power (63) this is starting to annoy me is my psu defective?

Sorry it is been so challenging, lets see what we can do
 
 
Full PC specs? please be as specific as possible -- (MFG and part number)
 
CPU & how cooled
MB & BIOS ver
RAM
HD
OS
 
TEMPs: Room, CPU, GPU (idle and load)
 
https://support.microsoft.com/en-us/kb/2028504
excerpt:
 
The kernel power event ID 41 error occurs when the computer is shut down, or it restarts unexpectedly. When a computer that is running Windows starts, a check is performed to determine whether the computer was shut down cleanly. If the computer was not shut down cleanly, a Kernel Power Event 41 message is generated.

An event 41 is used to report that something unexpected happened that prevented Windows from shutting down correctly. There may be insufficient information to explicitly define what happened. To determine what may have happened and to identify a potential resolution, it is important to know what the computer was doing at the time just before the event occurred.

If event 41 is logged because power to the computer was interrupted, consider obtaining an uninterruptible power supply (UPS) such as a battery backup power supply. An underpowered or failing power supply may cause this behavior. For example, if you added RAM or additional devices or hard disks when this problem began, the power supply may cause the problem.
 
Confirm: PSU power cords are fully seated on both ends, CPU & GPU Temps (remove any OC), RE-seat RAM and GPU
 
PSU power cord sockets can be a little tight before it is truely fully seated
 
If the GPU is drawing more power than it can be supplied it could cause a shutdow.  Run some benchmark software to load the GPU, does the PC shutdown?
 
 
1. Overclocking: Disable overclocking to see if the issue happens when the system is run stock settings
2. Check the memory: Verify the memory by using a memory checker. Set voltage in BIOS manually.  Turn XMP = OFF as a test.  Set timing manually
3. Power supply:
4. Defaults: Set MB to default BIOS settings, and run the system. You may need to adjust HD and memory settings --> Just No OC setting - yet
 

im so mad i plugged up my old pc and no shut downs all day put the new build back and it reboots whenever it wants