I have a good pc, but games still lag, what can this be?

Hello, i think by myself i got a pretty decent gaming pc, but yesterday, when i played assasins creed 3 i couldnt run it on max settings.
i checked Can u run it, requirementslab, and the bar was reaching fast.
this are my system specs.
Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz (running it on 4ghz).
8 gig 1600mhz ram ddr3
Microsoft Windows 7 Ultimate Edition Service Pack 1 (build 7601), 64-bit
amd radeon hd 6990 4gb graphic card
and over 1 tb free space.
850Watt power supply.
i really dont know whats wrong, but used drivesweeper to uninstal graphic drivers, and updated them after to the newest.
reinstalled windows 7.
maybe other people know what can be wrong, i cant find more solutions to try, thats why im posting here.

ps dissapointed gamer :P
2 answers Last reply
More about good games
  1. Try turning off crossfire. You should really be able to run it on max.
  2. Is it only one game or others as well? Double check your temperatures and make sure your antivirus wasn't running a background scan or something like that (reboot a few times and try the game again)
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