Typing this on an Acer Iconia w500 running Win 8 RTM.
Having used this tablet solidly for a couple of weeks, I am seriously impressed with 8's use of graphics processing architecture. The processor in these things is an AMD c-50, and includes an integrated 6250. The device hasn't once felt slow and laggy in any application use.
As for 8 itself... now I'm getting used to it on a touchscreen device, I am quite impressed. Contemplating trying it on my home desktop next, but like many I'm having doubts about the interface using a mouse.
I got one a few days ago also and windows 8 on it flies... got myself a nice little 64gb SSD upgrade also.. this thing even with 2gb ram just feels so speedy...