Diablo 3 - System Requirements.

Diablo III is an upcoming dark fantasy/horror-themed action role-playing game in development by Blizzard Entertainment, making it the third installment in the Diablo franchise. The game, which features elements of the hack and slash and dungeon crawl genres.

Windows
Operating system	Windows XP/Vista/7
CPU	Intel Pentium D 2.8 GHz or AMD Athlon 64 X2 4400+	Intel Core 2 Duo 2.4 GHz or AMD Athlon 64 X2 5600+
Memory	1 GB (1.5 GB for Vista and 7)	2 GB
Hard drive space	12 GB of free space
Graphics hardware	NVIDIA GeForce 7800 GT 256 MB or ATi Radeon X1950 Pro 256 MB	NVIDIA GeForce GTX 260 512 MB or ATi Radeon HD 4870 512 MB
Sound hardware	100% DirectX 9.0c compliant card
Network	Internet connection required for activation, single player, and multiplayer
Mac OS X
Operating system	Mac OS X 10.6.8/10.7.x or newer	Mac OS X 10.7.x or newer
CPU	Intel Core 2 Duo
Memory	2 GB
Hard drive space	12 GB of free space
Graphics hardware	NVIDIA GeForce 8600M GT or ATI Radeon HD 2600 or better	NVIDIA GeForce GT 330M or ATI Radeon HD 4670 or better
Network	Internet connection required for activation, single player, and multiplayer

Diablo 3 - Trailer