ram and graphics card have nuthin to do with each other if u talk abt them as separate entities
vysakh has explained this enuff
ddr 400 256 mb ram for 1.8 k ...
ddr266 256 mb ram 1.7k
that leaves u with 4.7-4.8 k
which will get u an fx 5200 ( dx 9 card)
or a gf4 ti 4400 ( i think ) ( dx 8.1) card
do NOT go for the MX series .. they SUC|<
[edit]
http://www.thinkdigit.com/forum/viewtopic.php?t=11517
there ya go
check blade's post there