The "Radeon HD 4850 X2" has 4 DVI ports, meaning it can support up to 4 monitors. What im trying to understand is from what will I benefit more?
Oh. You will benefit more from using a 9800GTX for strictly gaming and adding a cheap card for your second monitor. When you SLI, you cannot use more than 1 monitor. If you want the same screen on both monitors(clone), you can go for SLI. If not, you will have to run the cards separately.