Now,i'm new to this program, i've just replied once and that was in the games section with quake 3.if you've been there, you'll know that i'm a computer and a games freak. If ya wanna know something or are just have trouble and need help with anything got to do with computers, hardware, software, games and game consoles, you've come to the right guy.Now when you put 2 graphics cards in your motherboard, you only get to use 1. It is impossible to use 2. When you install the software and the drivers for the cards, you must pick which one to use.It is not totally impossible to use two graphics cards! if you want to use two, you have to buy a special graphics card that can be used for SLI.And to use SLI, you need a motherboard that supports it.SLI means using two graphics cards at once.and also, you need to have the exact same type and model of graphics card if you want to use it.SLI is really useful, but would cost too much.First you have to buy an SLI motherboard and then two of the same types of graphics cards.Don't go through the hassle and just buy a good single graphics card like a radeon x800 xt or a ge-force 6800 Ultra.