Streaming movies from PC

When I stream movies via media center from my PC to my PS3, is it using my PC or PS3 to play it? Also, are all HDMI cables the same in terms of quality? If not, is there like a comparable number on the package I can compare or something?

Thanks

Bump

use ps3 media server, the best there is. you dont need to download any codec packs, it reads your computer files from the ps3 and works with mkv files as well. my other option would be tversity media server (need codecs for this one)...unless you can plug an HDMI cord from your computer to the tv, then there is no need

Uh, so does anyone have an answer to my question please?