Even if you are running the standard version Of Battlefield You are gonna need ALOT of ram.
Anyone with a gig of ram should run Taskmonitor or Perfmon, and you would see that it typicaly takes 650-750 Mb RAM (depending on map Standard Battlefield). My freind has a 2.4Ghz machine, with a geforce 3 video card, and 512Mb of ram. He was noticing a little laggyness we messed with videocard and Ram, and by far RAM made the biggest diffrence.
Swaping out ram to the Harddrive in games is a huge problem. Watch your Harddrive light when you play.. Mine hardly moves. Practly no activity..
Of course This is pertaining to Windows 200 or XP. 9x Os's dont utilize RAM the same way and I cant speak as to how more affects performance in the Windows 9x (95 98 ME) system.
Moetop