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Multiple Audio Out from Radeon 7750?

post #1 of 19
2/10/13 at 7:52pm
Thread Starter 
Looking at replacing my video card with a Radeon 7750. I am trying to have two connections out of the card at the same time: 1 using HDMI to feed audio and video to my Samsung TV. Connection 2 to use DVI for video to my projector and SPDIF from the motherboard to my receiver. My existing set up uses the DVI / SPDIF to the projector/receiver, but I really need the Video and Audio to also go to the TV. Will the Radeon 7750 series accomplish this?
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post #2 of 19
2/11/13 at 6:03am
So

Video+Audio over HDMI to Samsung TV
Video over DVI to projector
Audio over S/PDIF to receiver (I assume your receiver does not support HDMI)

What else do you want?
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post #3 of 19
2/11/13 at 11:37am
Thread Starter 
The receiver does support HDMI, but I don't see any cards that have 2x HDMI out. I don't need anything else, but the ability to send individual streams of audio/video to two different components.
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post #4 of 19
2/11/13 at 11:50am
HD 7750 or higher (and all Trinity) supports dual (and more) audio stream over HDMI+DP. If the target device does not support DP (this is your case), you will have to use an active DP-HDMI adapter. But I haven't seen an active adapter that supports TrueHD/DTS-HD bitstreaming. Multichannle LPCM and DD/DTS bitstreaming worked with the adapter I tested.

Every GeForce card supports dual (quad with Kepler) audio stream over HDMI+DVI (with a generic DVI-HDMI adapter). There are a couple of GeForce cards with 2 x HDMI (here), although this is not important at all. Intel graphics also supports dual audio stream (not every mb supports audio over DVI port, however).

Adding two graphics cards is another solution (if your mb has two PCI Express x16 slots).
Edited by renethx - 2/11/13 at 12:01pm
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post #5 of 19
2/12/13 at 9:53am
Thread Starter 
Thanks for the response renethx. So will the 7750 card work with my original plan? Can I use the HDMI out of the card for audio/video to the TV, the DVI to the projector, and the motherboard SPDIF to the receiver? I couldn't find an active dp to HDMI adapter with a good review.
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post #6 of 19
2/12/13 at 10:14am
Quote:
Originally Posted by renethx View Post

HD 7750 or higher (and all Trinity) supports dual (and more) audio stream over HDMI+DP. If the target device does not support DP (this is your case), you will have to use an active DP-HDMI adapter. But I haven't seen an active adapter that supports TrueHD/DTS-HD bitstreaming. Multichannle LPCM and DD/DTS bitstreaming worked with the adapter I tested.

Every GeForce card supports dual (quad with Kepler) audio stream over HDMI+DVI (with a generic DVI-HDMI adapter). There are a couple of GeForce cards with 2 x HDMI (here), although this is not important at all. Intel graphics also supports dual audio stream (not every mb supports audio over DVI port, however).

Adding two graphics cards is another solution (if your mb has two PCI Express x16 slots).

When you say dual audio stream is handled, does that mean that the same audio stream will go out over both connections simulateously? Or could you have say TrueHD going out over one and DD over the other (like from the same movie)?
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post #7 of 19
2/12/13 at 10:35am
Yes, works, but why SPDIF to the HDMI receiver? SPDIF does not support HD audio bitstreaming.

StarTech DP2HDS should work with three limitations:

- Mulitchannel LPCM, DD, DTS are supported (enough for TV) but HD audio (TrueHD, DTS-HD HRA/MA, DD+) is not supported.
- No scaling option (i.e. underscan/overscan control)
- Full range RGB only.

The latter two are supported with this DVI-HDMI adapter, but no audio.
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post #8 of 19
2/12/13 at 11:42am
Thread Starter 
I'm thinking that going with 2 Radeon 5450s might be the better way to go. Then i can support TrueHD, and DD. Looks like they go for around $35 each. Any drawbacks to this?
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post #9 of 19
2/12/13 at 9:52pm
Possible drawbacks are:

- No MVC (BR 3D video codec) decode. CPU needs to be powerful enough to decode it, f you want to play BR 3D.
- Not powerful enough for most of madVR's algorithms, if you want better upscaling of DVD/SD than AMD's (= bilinear).
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post #10 of 19
2/20/13 at 2:41pm
Thread Starter 
renethx - thanks for the response - great info. I ended up ordering two HD6450s from NewEgg. I'm not into 3D, so that won't be a worry. I can live with the lack of upscaling of the SD.
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post #11 of 19
2/22/13 at 8:13pm
Thread Starter 
I got the HD6450's installed, updated to latest driver, however, I can't get them to "mirror" or "clone" the desktop. My only option is to "Extend". Any ideas on how to have the cards display the exact same thing on both the projector and the TV? I'm running Vista SP2 32-bit and the latest release (13.1) of Catalyst Center.
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post #12 of 19
2/22/13 at 8:32pm
Two graphics cards cannot be cloned.
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post #13 of 19
2/24/13 at 12:11pm
Thread Starter 
So it looks I'd be better off splitting the signal from 1 card than have 2 cards installed? I guess I didn't explain what I was trying to do clearly. I wanted to be able to watch/control my HTPC output in my theater room via the projector and the AVR. If I didn't want to fire up the projector, I wanted to be able to turn on my TV in a different room, and watch/control the HTPC from there. I'm using a wireless keyboard that I can take from room to room. The problem with the extended display, I can't control the primary display without starting up whatever device (projector or TV) was used last as the primary device. Any suggestions? Should I return one of the video cards and go with one of these instead?
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post #14 of 19
2/24/13 at 1:04pm
Press Widows key + P, then you will (or will not) see



where you can select the display device(s) to use. If you don't see it (say, the last time you turned on the projector only and now you try to use TV only), select the display by pressing the left or right arrow key three times, then Enter key. You can also create a .bat file
Code:
displayswitch.exe /internal

for "Computer only" and
Code:
displayswitch.exe /external

for "Projector only". (/extend for "Extend")
Edited by renethx - 2/24/13 at 1:37pm
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post #15 of 19
2/24/13 at 2:07pm
Thread Starter 
I tried the "windows + P" key and nothing happened. I then hooked up an old school PS/2 keyboard, thinking the wireless keyboard was the problem, but that didn't work either. I tried the "displayswitch.exe" by itself, and with the /internal and /external command, and each time I got a message "displayswitch.exe is not recognized as an internal or external command, operable program, or batch file". Doing some other searching, it appears that doesn't work when two cards are installed. Any other ideas?
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post #16 of 19
2/24/13 at 2:44pm
What's your OS?
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post #17 of 19
2/24/13 at 3:05pm
Post #11 Vista 32bit
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post #18 of 19
2/24/13 at 3:52pm
I see, this function is not supported by Vista. I don't know if there is a workaround for Vista as easy as displayswitch.exe.

I guess GeForce may work better in such a scenario because it supports dual audio stream. Connect TV and AVR/projector to the same GeForce card and clone mode should work. For example, EVGA GT 630 GDDR5. Use a generic DVI-HDMI adapter to connect two displays.
Edited by renethx - 2/24/13 at 3:59pm
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post #19 of 19
2/24/13 at 4:42pm
Thread Starter 
How about this splitter from Monoprice?
http://www.monoprice.com/products/product.asp?c_id=101&cp_id=10113&cs_id=1011306&p_id=8204&seq=1&format=1#largeimage
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