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285 SSC SLi or 295 quad?

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Hello, I have been having a hard time getting the information on this. I had a 720W power supply, so I thought I'd be able to run 2 285's, and not spend too much money. I had to upgrade my power supply anyway, to a Zalman HP-1000. My cards run fine now, but it would only cost about 250 cdn more to go to Quad SLi. I didn't do it in the first place, because I didn't plan on getting a new PSU. I have a Q9550 at 3.6 Ghz, and 4 gb of ram on a 780i mobo. I can play Crysis: Warhead fully on enthusiast and 4x AA at 1920 x 1200, but when the action gets too intense, it can drop to about 20fps, though it averages above 40 during most play.

Is this a CPU or GPU limitation?

Thank you for any help, I'm brand new to the forum, but I'll give rep for help.
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It is probably a driver/GPU limitation not taking full advantage off QUAD SLI.

here is a good way to check: Run task manager in full screen (maximized) then play some crysis, when the action gets heated, tab out after a few seconds of low FPS. If you see close to 80% CPU usage then it is CPU bound. If you are looking at less than 60, I would think its GPU related
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