no its not bad it won't ruin performance

you have alot more ram than me and my pcs a fast bastard

1.66ghz processor and 384 ram a 256ram stick and a 128

just make sure that your program doesn't use a lot of proccesses or doesn't load alot of programs when you boot up because that eats your ram and slows your pc down

also don't use the vista aero theme if your on vista

it eats you ram like an ethiopian with a meal and requires a MINIMUM of 2gb ram