advice needed!

[antran]

This is my current build, what's should i replace? I like my AA but I think my gpx card and my monitor are bad combination. I'm thinking of replacing my gpx with the ATI 4870 1GB, I do play a lot games. Thanks

[email protected] GHZ
Asus P5N-E Sli
2Gb Patriot DDR2 800Mhz
Gainward 8800 GTS 512
24" Samsung SyncMaster 245B
2x 75GB HHDSata II
120GB HHD
Window XP