I am looking at converting a system into a HTPC setup and had some questions about the ATI Radeon HD 2600.
1) What are the differences between the ATI Radeon HD 2600 Pro 256MB and ATI Radeon HD 2600 XT 512MB, besides the obvious difference in RAM?
2) I will be using this to mainly play HD movies (720p/1080i - h264) from the hard drive, so is it worth it to go with a 512MB card, or will 256MB be enough?
3) I have read that these cards have support for HDMI / 5.1 surround. How exactly does this work? I don't see any HDMI output on either card. Do you have to get a DVI to HDMI cable? How does the sound work? Is that just for HD / Bluray discs, or will it supply sound from any source?