My experience is that getting an HD TV to work with a Mac is a major pain in the butt. Unless you've got a DVI->HDMI cable, prepare to do some fiddling with resolutions, SwitchResX or DisplayConverterX.

I have tried to connect two iBook G4s, a PowerBook G4 (15" aluminum), and a Digital Audio (dual 533). The processor speed is unimportant, but the video card makes a difference. So far, the DVI connections have been the best. Generally speaking, they are trouble free (if you don't count having a black border). I have a VGA connection on my TV, and that interface is virtually impossible to configure. None of the Macs allow the right resolution out of the box, and they have all required the use of one of the display utilities mentioned above.

I think the video cards I've tried are as follows:

Radeon 9200, 32MB (iBook G4 800MHz 12") (VGA)

Radeon 9550, 32MB (iBook G4 1.33GHz 12") (VGA)

Radeon 9700, 128MB (PowerBook G4 1.67GHz 15") (DVI)

Radeon 9000, 64MB (upgraded PowerMac G4 dual 533MHz "Digital Audio") (DVI)

Apparently, I haven't tried any Nvidia cards. That wasn't by design - I just never got around to it. I've got a GeForce4 Ti 4600 in my MDD, but I've never bothered to connect it to my TV because it's too loud. I've also got a Radeon 9600 (128MB AGP 4x/8x pull from a G5 that I doctored to work in AGP 4x Macs) that I've never tried.

With the VGA cards, I had to do a lot of playing around with resolutions, refresh rates, "front porches", "back porches", and all sorts of other stuff I had never heard of before. And then I never was able to get 1080i or 1080p out of them. The best I could do was 720p. The DVI cards worked pretty well on the first try, and both gave me 720p and 1080i.

So that's my experience. Your mileage may vary.

Peace,

Drew