My son has Windows 7 Home Premium, 64 bit with 4 gigs of ram and he was wondering if he would see much benefit upgrading to 8 gigs. He has a duel monitor setup and plays all the latest games. Also uses Photoshop and Mya. He has a Asus Crosshair motherboard, Radeon HD 4870X2, AMD Phenom II X4 955 Black Edition Deneb 3.2GHz, CORSAIR XMS3 DHX 4GB. Is it worth while to add 4 more gigs?