HD4890 lagging on GTA:SA?

Hello, since I got my new computer about 3 months ago. I noticed some lag on GTA:SA maxed out? I mean my PC specifications are:
Intel Core i7-950 3.07ghz with watercooling
Sapphire Radeon HD4890 1GDDR5 with watercooling (not sure if the name was like this I don't remember, but I remember it was a HD4890)
Windows 7 Ultimate 64-bit
550 W PSU.
HD4890 goes up to 50 celsius on load on high graphics games like BF3, MW3 and other.. Even playing on BF3 I get better fps than GTA: SA. I get 69 FPS on gta sa while maxed out, and I am going up to 75 on BF3 on medium, 1680x1050. Any help will be good.. Also, my CPU doesn't go more than 49 celsius on load on BF3...
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More about hd4890 lagging
  1. If you're gaming at 1680x1050 and GTA is only using med settings, I would expect the HD 4890 to be fairly stutter free. But that game is graphically demanding. Is your sysetm clean of resource wasting crap, registry errors, and stuff running in the background? I would run CCleaner a couple times and check your Sys Config/Startup to see how much stuff is starting up with Windows. If kept clean, you shouldn't see more than a half dozen or so items with check marks.
    CCleaner: http://www.piriform.com/CCLEANER

    Are you sure the graphic card has water cooling, and not just the CPU?
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