hello i recently got my copy of skyrim and i would like to no what i would need to upgrade to get a pos solid 60 fps on ultra with aa 8x
im thinkin gpu but maybe just more ram would do? running it on ultra at 1920x1080 all sliders maxed no aa no astrophic on game settings but using amd control panel forced on box aa 2x and 16x antistrophic. its playabel but the framrate and stuttering is a let down.

my specs

amd phenom x6
asus 5870 matrix 2gig plattnom
2x2 kingston reeper ram 2000mhz
1T western digital black HH
windows 7 64bit
corsair hx1000 psu
asus crosshair formula IV

everything at factory settings.

thanks