Mark "No DTS.....No ac3??"

This means the DSM-750 can't decode these. It can still pass the coded stream to an AMP for decoding. Most people who want DTS or AC3 have an AMP (this decodes DTS/AC3 etc).

From a HTPC builder trying to build a bluray HTPC:
1. All graphics cards are only HDMI 1.2.
2. You can get Displayport to HDMI1.3 converting cables. This sounds good at face value but..
3. Displayport has the bandwidth to pass things like DTS HD master audio (24Mbps). True, but if you pass the audio signal to the graphics card using a SPDIF cable (1.5Mbps max bandwidth) then you don't have to be a rocket scientist to see thst's not going to work.

The card makers only ever tell you their card is "HMDI" hoping to catch the customers who don't bother to check what version it is (not 1.3). The card makers are telling you they have "displayport" card but will never mention things like "DTS HD master audio" because they can't do it.