KitGuru tried the Asus ROG G20AJ
A quote from the article:
Asus aims to pull off a neat trick with the Republic Of Gamers G20AJ. They have taken a desktop Core i7 CPU and a desktop GTX 970 graphics card and crammed the two of them into a tiny 12.5-litre chassis that appears to be a similar size as a Sony PlayStation 4.Asus ROG G20AJ Review @ KitGuru