What Google has said:
At launch, Google says the service will be able to run games at up to 4k at 60 fps with a 30 Mbps connection, with presumably a slower speed allowing for 1080p.
The platform will scale down the framerate and graphics for internet connections below 30 Mbps. “If you have less bandwidth we’ll give you a lower resolution,” Harrison told Kotaku.
All Stadia games will require a constant internet connection. If your internet goes down, you can’t play them.
Stadia can run on any device that has Google Chrome, including phones, tablets, PCs, and TVs.
The Stadia data center PCs where games will actually be running will use Linux.
Data center PC specs:
GPU: 10.7 teraflops, 56 compute units, HbM2 Memory.
CPU: Custom x86 Processors, 2.7 GHz, Hyperthreaded, AVX 2.
Memory: 16GB of RAM, up to 484GB/s transfer speed, L2+L3 Cache of 9.5MB
Early on, releases from the newly-formed first-party studio Stadia Games & Entertainment will be smaller and aimed at highlighting the platforms unique capabilities.
First-party games will be Stadia exclusives.
Most second-party games will be exclusives and the ones that aren’t will have Stadia exclusive features.
Doom Eternal has been confirmed for Stadia.
The Stadia controller is required to play games on a TV with a Chromecast.
Google has sent Stadia dev kits to over 100 development partners. Harrison told us that the games available on Stadia at launch and shortly after will be revealed in the summer.
According to Harrison, the video game-inspired icons shown during the lead-up to the GDC presentation are not indicative of the types of games coming to Stadia and were just for fun.