PC:
Fully-updated Windows? XP/Vista/7 with DirectX 9.0c
Intel Pentium? D 2.8 GHz or AMD Athlon? 64 X2 4400+ (or better)
NVIDIA? GeForce? 7800 GT or ATI Radeon? X1950 Pro (or better)
1 GB RAM (with Windows XP)or 1.5 GB RAM (with Vista or Windows 7)
12 GB available Hard Drive space, DVD-ROM drive (for retail disc versions only)
Broadband Internet connection
Video settings reaching a minimum resolution of 1024x768


Mac:
Mac? OS X 10.6.8, 10.7.x or newer
Intel? Core 2 Duo CPU (or better)
NVIDIA? GeForce? 8600M GT or ATI Radeon? HD 2600 (or better)
2 GB RAM
12 GB available Hard Drive space
DVD-ROM drive (for retail disc versions only)
Broadband Internet connection
Video settings reaching a minimum resolution of 1024x768


You can take a look in this official requirements by the Blizzard for the computer requirements about the Diablo 3. You can make a comparison and then you can know the answer. Hope this will be helpful to you. Besides, I think you can in this website to find more information about Diablo 3. Good luck!