Video card upgrade - compatibility check
I have a few compatibility-related questions involving video cards. First, I would like to upgrade my current video card (the GeForce 7600 GT) since it's about 5 years old. I have several questions:
1. Will upgrading just my video card improve the speed at which video files are compressed and/or processed? From what Wikipedia is hinting at, based on fill rates and the such, today's cards are a good 50+ times faster than what I currently have. I only intend on upgrading my video card for faster video processing, not gaming.
2. It seems like, given Wikipedia, every video card after the 7xxx series uses a DirectX version I don't have access to (Windows XP stops at 9.0c). Would a DX11 card work on XP? I would think it should.
3. Lastly, more generally, will a GeForce 560 GTX or GeForce 460 GTX (the kind of card I would like to go after) work with my computer? My current motherboard is the Gigabyte G31M-ES2L, if that helps. Only the video card is being replaced in this case.
Thanks for any information on this.