It seems that many threads are popping up with questions about minimum computer specs and if their computer will run the Beta. In order to keep things in a single location and to help others who might also have questions, I have created this thread. Here you can confirm your computer meets the minimum specs, learn how to upgrade your computer, and ask questions about parts for a new build. Do not forget that these specs are for BETA and could change for the full release.
The Diablo III Beta Requirements
PC
OS: Windows® XP/Windows Vista®/Windows® 7 (Latest Service Packs) with DirectX® 9.0c
Processor: Intel Pentium® D 2.8 GHz or AMD AthlonTM 64 X2 4400+
Video: NVIDIA® GeForce® 7800 GT or ATI Radeon™ X1950 Pro or better
Mac
OS: Mac® OS X 10.6.8 or newer
Processor: Intel® Core 2 Duo
Video: NVIDIA® GeForce® 8600M GT or ATI Radeon™ HD 2600 or better
All Platforms
HD Space: 12 GB available HD space
Memory: 1 GB RAM (1.5 GB required for Windows Vista®/Windows® 7 users, 2 GB for Mac® users)
Drive: DVD-ROM drive
Internet: Broadband Internet connection
Display: 1024×768 minimum display resolution
(Note: Be advised that some wireless connections do not meet the minimums required to be a true Broadband Internet connection. Wireless results may vary.)
RECOMMENDED SYSTEM SPECIFICATIONS
PC
OS: Windows Vista®/Windows® 7 (Latest Service Packs)
Processor: Intel® Core 2 Duo 2.4 GHz
or AMD AthlonTM 64 X2 5600+ 2.8 GHz
Memory: 2 GB RAM
Video: NVIDIA® GeForce® 260 or ATI Radeon™ HD 4870 or better
Mac
OS: Mac® OS X 10.7 or newer
Processor: Intel® Core 2 Duo
Memory: 2 GB RAM
Video: NVIDIA® GeForce® GT 330M or ATI Radeon™ HD 4670 or better.