Looking to get a mish-mash of hardware working for HTPC 5.1 setup

Mar 3, 2018
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I have a Dell Optiplex 3010, small form factor, with only stereo native audio output, running Win 7.

We already have a projecter, but it's kind of old and only has VGA input. That's fine, because the HTPC has VGA or HMDI video output

I'm trying to upgrade us to a 5.1 audio system, and so I bought the Onkyo HT-S3800, without realizing it only has HDMI inputs (who does that?). I also bought a SoundBlaster 5.1 PCIe card.

The computer has HDMI *video* output, but doesn't show as having HDMI *audio* output. I hooked the Onkyo system up to the HDMI port and looked around the sound settings for the HDMI output and couldn't find it.

I Googled for Dolby 5.1 to HDMI converter, but they don't seem to exist.

Should I return the Onkyo system and try to find something that works? Or would a video card with HDMI output provide the 5.1 surround output I'm looking for? HDMI --> VGA adapters are cheap enough.
 
Solution
I have my HTPC setup as follows for reference. Using a Yamaha RX-V473. The HDMI output on GTX 970 goes to the HDMI input on the receiver. HDMI carries both audio and video. Then, using another HDMI cable, video goes from the HDMI output of the receiver to HDMI input on my TV. No 5.1 audio card is needed. I enabled HDMI pass through on receiver, which allows video/audio to both play on TV alone when I don't have the receiver powered on for "quiet" PC gaming,ect. This setup works fine for me, though there may still be issues with "true" 5.1 in situations vs simulated in receiver settings. I'm not the most versed in encoding/decoding ect. and with audio specs.
I have my HTPC setup as follows for reference. Using a Yamaha RX-V473. The HDMI output on GTX 970 goes to the HDMI input on the receiver. HDMI carries both audio and video. Then, using another HDMI cable, video goes from the HDMI output of the receiver to HDMI input on my TV. No 5.1 audio card is needed. I enabled HDMI pass through on receiver, which allows video/audio to both play on TV alone when I don't have the receiver powered on for "quiet" PC gaming,ect. This setup works fine for me, though there may still be issues with "true" 5.1 in situations vs simulated in receiver settings. I'm not the most versed in encoding/decoding ect. and with audio specs.
 
Solution