Hi all. I wanted to report a very successful experience with Steam in-home streaming of TGC.
My main PC is in the office and I wanted to play TGC back at the 55" living room TV where I'd once played the PS4 version of the game. Naturally Steam streaming was the answer (or so I'd heard).
The real key is the power of your main PC playing the game. As I have a total beast doing that (6 core - soon to be back a 4 core Haswell though - with a GTX 980), no issues on that end.
On the other end, you simply need any type of PC that can handle h.264 streams well (as I learned that's how the video gets beamed from Steam to Steam).
For that I bought a really low specced PC to sit by the TV:
1. Zotac ZBOX BI320 (got for $110)
2. 60GB SSD ($45)
3. 4GB RAM (2x2gb - $40 total)
Installed a copy of Win 8.1 and done!
And it performs beautifully! On my main PC I've normally been running 2048x1080 @ 60fps and for streaming I slightly tweak it to match the TV @ normal 1080p and the performance is amazing.
As I'd said in another thread -- I truly feel that streaming from my PC to another PC at the TV is providing a *better* experience than my PS4 version of TGC was when hooked up directly to the TV.
It seems apparent that the PC version is, unsurprisingly, capable of much more than the console versions due to all the potential horsepower you can throw at it.
Anyways - No point to the thread other than to share the story.
**one note about GPU - I did this test also with a GTX 970 and it worked the same for me. I don't think the streaming portion is really dependent upon much more than your network connections between devices (wired GB Lan here)