Depends on the game. A few, notably BF1942, can use lots of RAM. However, most games do not need that much. Large amounts of RAM may decrease performance very slightly if the system does not need that much, but I don't think enough to be noticable.
oh well i think i will just go for 1.5gb of ram lol becuase i got some spare ram parts lying around and just want to get rid of them as quick as possible
no one have any idea if prime 95 can address up to 1.5gb of ram for testing??
well, i have a gig of DDR, its really nice. BF1942 has used over 700mb for me before, but thats it. I would say that at the moment 1.5gb is excessive, unless you have a specific need for it. But go for the gig, its sweet.
Prime95 DOES test RAM. It actually tests all free RAM on your system.
Just open task manager and have a look, it will spike to your max, then go back to 20 or so, then spike, then back etc. Only when it reaches certain stages though, it doesnt start doing it stright away.