Courtesy of our (now very, very busy) SC2 sister site, here are the SC2 beta system requirements.
PC Minimum Requirements:
? Windows XP SP3/Vista SP1/Windows 7
? 2.2 Ghz Pentium IV or equivalent AMD Athlon processor
? 1 GB system RAM/1.5 GB for Vista and Windows 7
? 128 MB NVidia GeForce 6600 GT/ATI Radeon 9800 PRO video card
? 1024×768 minimum display resolution
? 4 GB free hard space (Beta)
? Broadband connection
*Note* the final requirements for Starcraft II have not yet been determined. Due to ongoing development the minimum requirements listed above are subject to change at any time. During this phase a Mac version will NOT be available, please check back.
Now obviously SC2 is not D3, hardware will progress with a couple of years before D3, and beta requirements are not final game requirements… that said, if you’re looking for ballpark figures for Diablo 3, you could do worse than to extrapolate from these.