Hi, I am using Alienware M17X R3. And recently my video card has broken down. My Video Card is : ATI HD6870M and it is broken. the video card that I can insert into my device should be HD6870m again, or can I insert nvidia or another video card. BIOS version A12
Yes you can use any Nvidia card up to the GTX 880M. You will need the unlocked BIOS for the 700M and 800M series and there can be issues getting the HD Audio to work after the upgrade. An easier upgrade would be the GTX 680M but any Nvidia card above the 500M series will require a modified display driver.
AMD cards are much easier to install as they have driver support without having to mod one. The 8970M (also called the R9 M290x) is pretty much the best AMD card you can install.