battlefield 2 lags on medium

my specs are

athlon 64 3200+ 2.00
ati radeon x850 xt saphfire version
1 gig of corsair ram 3200 400 mhz or somthin like that
300 watt power suply

and when i start a game it lags then it doesn't while i play for a lil while
it never used to lag before

 

Definitely need a better psu, at least 460W I'd say with that setup!!!

Also, is this on multiplayer or single player?
Could just be a slow server if it's multiplayer, or your connection.