BTW, after some looking... the formula I used is wrong. DDR 400 is 200MHz * 2 data transfers per clock rather than 400MHz with 2 transfers. So all those bandwidths would be half of what I posted. In other words... it takes a card with a memory buss of 625 or higher to achive the bandwidth Microsoft wants for HDTV in VMR9 with a 128bit memory grahics card.
With a 256 bit card it would be half that.
As far as I could tell, if you want to go with passsive cooling and HDTV you must go 256bit on the graphics card to meet the Microsoft spec.
That should probably be in a guide somewhere.
The *only* passively cooled card under $200 that meets the 10GB/sec requirement (that I found) is the HIS Hightech H130H512N Radeon X1300 512MB 256-bit GDDR2 PCI Express x16 CrossFire Ready Video Card priced at $120.
http://www.newegg.com/Product/Produc...82E16814161167