NVIDIA display over HDMI and ATI sound over HDMI using one mainboard

Hello everyone,
I was curious to know if it is possible to use a setup where I use an NVIDIA card to send display over HDMI to my receiver and at the same time I use an internal ATI chip to send audio over HDMI to the same receiver.
In my setup it is a GA-MA78GM-S2H mainboard with a built in ATI HD3200 IGP and an NVIDIA 9500GT GPU and I'll be using XBMC as media centre.
The problem is there is no hardware acceleration support for the display of full-hd (1080p 24) for the ATI chip, whereas NVIDIA using VDPAU is.
On the other hand the 9500GT doen not support audio over HDMI (unlike the newer models like GT210 or GT220), I can connect SPDIF to the NVIDIA card to allow some sort of audio over HDMI, but in that case I'll still have the bandwidth limitation associated with SPDIF.
I tried to set up a box with both NVIDIA and catalyst drivers to use the above functions, but when I try to install catalyst drivers I get a hardware conflict notice that NVIDIA and Catalyst drivers cannot be installed at the same time on the same system.
AFAIK I need the catalyst drivers (or hd-radeon) in order for also to recognize the device (?)
Anyone any information if installing both drivers is required and possible? Or are there any other methods to achieve such set up?
TIA,
daf art

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NVIDIA display over HDMI and ATI sound over HDMI using one mainboard

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