Hi. first time evga buyer and ive been having problems with my 780 SC ACX. 
 
This doesnt happen in single player games where its mostly gpu independent then im at 99% gpu usage but in games like BF3 its at around 50-60% gpu usage and sometimes it has a hard time putting out 60 fps at most of the maps. Also it goes up and down like madness from 40 to 85 and almost never hits 90+.
I've reinstalled windows and ive tried every driver out there and even a modified one. 

 
This is WITHOUT V-sync. 
Some guys tells me my CPU is bottlenecking. Question is how can a i5 4670k cpu bottleneck like this? Anyways someone told me to overclock..... well i cant overclock since for some reason it hangs up on bios screen if I try to overclock just a little. I saw the vcore and its on auto trying to push out 1.4 vcore at stock clock LOL. If i even try to push the multiplier system becomes unstable.
 
I have no idea what to do now.... it seems silly to RMA the card just because its failing on 1 game. It must be something else right???? 
 
My specc: 
GPU: 780 SC ACX
MOBO: Gigabyte z87n-wifi
CPU : i5 4670k stock
RAM: 16gb corsair vengance low profile
PSU: Corsair 750w
 
Any help appreciated
 

dwoodward
Although there is a chance with the GTX 780 that you are getting CPU Bottlenecked, I highly doubt you're getting bottle-necked by that CPU enough to cause the issues you are running into. I ran BF3 on a slower CPU with a GTX 480 without issues for months and months with maxed out settings.
 
As for your CPU voltage, do you have any in windows CPU overclocking software that maybe came bundled with your motherboard or another product? If so, uninstall it from your system. Also, might be a good time to download RealTemp from tech power up to check your CPU temps. That voltage seems very high to me. I wonder how hot your CPU is running.
 
For your video card, without a certain CPU bottleneck it's hard to diagnose this issue. Anyhow, what does your +12v rail read for voltage in the BIOS?

 
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This is temps when im currently playing WoW. On BF3 it doesnt go higher than 50 ish.
 
 
IDK how to check rail thing lol. Can someone tell me how?

It says 11.880 is this bad or good idk lol.

Adamed91
Your CPU is most definitely not bottlenecking your 780... My i5 3570K is at stock and useage in BF3 never goes over 80. What drivers are you using out of interest for the main part? The new WHQL ones suck for my my 780, got drops into the 50s aswell (I assume my GPU usage dropped causing the frames to). Went back to the previous Betas and BF3 seems to run OK again. 

Im on latest that came out 4 days ago. Before that I had 320.49 drivers and that gave me exact same problems. Irritating to say atleast.. 

I cant go with 320.18 cuz it gives artifacts with BF3 -.-

Now suddenly my cpu is overclockable. I am at 4.3 ghz and gonnah try to test it out with it. But I dont see why i need to overclock to play this over 60fps lol.

My CPU is very power hungry. to even reach 4.2 i need to push out 1.4 vcore which sucks...

chadi95
It says 11.880 is this bad or good idk lol.

Typical voltage for a 12v rail is somewhere between 11.8 and 12.2 so yes, that's normal. However, I imagine that was sitting on your desktop, try loading up a game like BF3 and see what happens. There is usually vdroop on the 12v rail when under load.