would Single 512MB GDDR3 ATI® Radeon® HD 4850 run games such has(WoW,RoM,Aion etc..) good?and by good and by good i mean 60+ fps in nobody and 50+ in crowded places on medium settings?
More aboutwould well
Provided the resolution isn't TOO high and you had a decent computer to plug it into, yes, that card would run those games well. A more definite answer could be had should you list your specs (Monitor resolution, CPU, Mobo, Brand and power of PSU).
depends on your monitor resolution, CPU, internet connection, and server population
but the 4850 can max out WoW and Aion so you should be good in the GPU department