Nyt grafikkort til Arock FSB 400 vs call of duty 4

Hej, jeg har en af mine venner, som er blevet hooked på at spille Call of Duty 4, men hans gamle grafikkort som sidder i hans efterhånden gamle computer, kan ikke trække spillet.
" Graphics
You can run Call of Duty 4 on a GeForce 6800, but it just won't look or play all that great. We tested more than 20 video cards to help you figure out what GPU best matches your budget and performance needs.
CPU
Ditch the single-core processor. Call of Duty 4 requires a dual-core processor to run well. We tested three different kinds of Intel processors and three AMD processors to help you decide what's enough versus what's overkill.
Memory
The Call of Duty 4 system requirements state that the game only requires 512MB of RAM to run, but you're going to have to turn down all the settings to get the game to run well with that little memory. A bump up to 1GB of RAM solves most of the problems, but we went ahead and checked out what upgrading to 2GB, or even 3GB of RAM, can do for performance. "

Der sidder en ASUS GeForce FX 5700LE lige nu som sidder på et Asrock FSB 400, som ligner det her: http://www.asrock.com/mb/photo/K7Upgrade-600(Enlarge).jpg Med de mærkelig sockets, som "almindelige" grafikkort ikke kan passe ind i.
Hvad for et grafikkort vil passe ned i, før at han kan spille call of duty 4?
Det skal helst ikke være et dyrt et, da han ellers lige så godt kunne gå ud og investere i en ny stationær, som han ikke vil da han bruger sin bærbar.