well it's bought from a computer firm that combines components and sell them.. so i don't even know if there is an particular model name.. i can tell you that most of the part is from ASUS but that's about it.. :|
I've got 1 more thing to try, hit ctrl+alt+delete and go to task manager and go to the performance tab. Try playing a game and in the middle of playing alt+tab out and see if your processor is topped out.
Sorry if this question has been answered already but is your computer always a little sluggish or only during games?
ASUS M4A79XTD EVO | 4gb DDR3 GSkill | 550W Corsair power supply | AMD Phenom II X2 550 Black Edition Callisto 3.1ghz(Unlocked 2 extra cores) | Sapphire 4870 512mb | 500gb Samsung |21.5" 1080p Hdmi Dell monitor| 21.6" Samsung monitor | RAIDMAX Tornado ATX-238WG | Windows 7 Ultimate Signature Edition