I need some help. I'm getting lower fps than I think I should be on a number of games. Sleeping Dogs with the hi-res pack on extreme runs at 45fps while my friend who has the same card gets solid 60 with vsync on and more if not. max payne 3 at full AA tells me I'm only using 2030mb of vram and yet I'm getting 27fps. Hitman and some others are similar. I think it's related to AA as the frames go up when I turn is off. My setup is as follows:
i7 4770k 3.5ghz
gtx 780 sc acx
16gb kingston hyper x ram
750w 80+ gold psu
asus hero VI
I've done a clean install of the latest driver and nothing is overclocked. I've read on many forums that my system should be able to handle pretty much anything at 60fps. It is bothering me because I paid £400 for this card and expect top quality performance. Could someone suggest some others things to try please?

AMD FX8320 3.5ghz (overclocked to 4.3)
Asus Crosshair V Formula-Z
650w gold psu
8gb kingston hyper x 
gtx 780 sc acx

yeah 1080 and with sleeping dogs and max payne 3, everything at max. 

Hottest it gets playing Sleeping dogs on max settings is 52/53 but normally stays around 48 degrees. It's only using 22% of the cpu's resources. My card is showing a gpu clock of 992-1005mhz and voltage of 1075 when playing games.

yeah 324mhz and a voltage of 875 with no games running.

No. Today we swapped our cards over and tried them in both systems. My card worked fine in his machine and his did the same thing in mine, i.e., dropped to 45 fps while playing Sleeping Dogs. Does this mean that my card is functioning correctly and that it's another component that needs looking at? 

I re-installed Windows last week so it's all fresh there. Yes he's running the hi-res pack.

Yeah BIOS is the latest and no I haven't tried in the other slots although today I was going to but couldn't bothered. I'll have a go now.

Couldn't fit the card into the black PCI slot. The second red one read as follows and there was no change to the fps in Sleeping Dogs using in this slot, still dropping to 45:

 

The frames remain the same at stock clocks and we both have the same driver without mods. 

Okay will do. Yes, same OS, Windows 8.1. Thanks for your help. 

My friend is very slow at doing anything so I'll post mine and let me know what you think. If you really need his let me know but it could be a while . . .
 

Yes your card give fantastic result, better score than mine ex GTX780 Classified with 993MHz.
OK now Futuremark is updated and drivers are newer but nice score. Did you change CPU Clock maybe? Try to Enable Turbo.
I think your CPU Score can be higher in Firestrike.
Result of reference GTX780 (876MHz) is about 8600-8700 and about 9200-9300 Graphics Score in Firestrike, everything over you got because you choose SC model.