the game works nice on my 8500gt card with 1gb ram and dual core processor.I can almost play it on high but should be on low resolution.will it help if i buy another 1gb ram to play on high with high resolution?

the game works nice on my 8500gt card with 1gb ram and dual core processor.I can almost play it on high but should be on low resolution.will it help if i buy another 1gb ram to play on high with high resolution?