I7 3770K Bottlenecking?

Hey guys hope all is well and would like to ask for some input on a problem I'm facing :|.

I've recently built a rig for somebody and he is having issues (performance wise) in bf3, mohw ect
He is currently using Windows 8, he had the same issue on Windows 7, spent loads of money trying to eliminate this issue, including spending another £350 on a 120hz monitor, also compared with Hyperthreading on and off, personally I can't see it being a i7.

His gpu usage does not stay above 75% usage on both cards, even tried overclocking his I7 to 4.8GHZ, so do you think the beast of a i7 he has can really bottleneck is gpu cards, specs are below:

i7 3770k @ 4.8 ghz
Asrock z77 Extreme6 Motherboard
8gb Corsair Vengeance @ 1600mhz
2 AMD 7950's in crossfire
Antec watercooler
Corsair TX850w
OCZ SSD 128gb (windows 8 64x)
Western Digital 2tb green drive storage.
5 120mm case fans.

Uhm, so he is getting low FPS, tearing...what?
Try taking one of the 7950's out and run the game with just one.

Several people are having problems running multiple AMD cards in Crossfire.......examples are extremely low FPS, crazy glitching/stuttering and some flat out won't play. Try one card with the newest AMD driver and see how that works. The 3770K likely has nothing to do with it.

thanks for all your replies , he is getting very low fps, why he got the monitor i dont know, he has tried the latest driver and the beta one its still the same, he even asked if it could be psu related but surely the 850w Corsair should be up too the job.

That suggestion about windows 7 disabling inactive cores? does that work in windows 8 aswell? and if so how would one go by disabling that feature? he said the issue he is really getting annoyed with is he will be playing at around 90 average fps peaking to 120ish and the fps will dip to about 47 making the game really choppy and feeling like 20fps, then will shoot back up is this common? he has disabled.one card for the time being lets just hope AMD release a driver soon.

Thanks again guys really appreciate the input

Hey bud, he was getting the issue before he got the 120hz monitor, for what I believe he tried a 90 and 120fps lock, the 120fps lock seemed to improve the "microstutter and frame rate drop" but not alot, he did tell me that some times when he turned his pc on with crossfire enabled his pc would fail to start, would just lock on the welcome black screen.

Could this just really be bad coding in games for crossfire and sli? or could it just be a driver issue? the cards work flawlesly when on there own.

He dont have a anti virus installed.

thanks bud for the input

Drops to 47FPS and feels like 20. That's a rather silly experience.
Disable Vsync, use a fps limiter. Your eyes cannot perceive past 60fps, so I really don't see what is the deal with people wanting a million hz monitor. You will never notice a difference whatsoever.

You are saying that the trouble goes away when he uses only one card correct?
Personally I thought one 7950 was overkill for such low end games, two is ridiculous, specially if you expected those sort of games to take advantage of crossfire, and on top of that crossfire can be tricky, as it is commonly tied with jerkiness when not set up correctly, and when the software cannot even take advantage of it. Why else do you think you are only getting 75% usage?