These are the recommended requirements for the game.
Diablo 3 Recommended System Requirements
PC Requirements
OS: Windows Vista®/Windows® 7 (Latest Service Packs)
CPU: Intel® Core 2 Duo 2.4 GHz / AMD AthlonTM 64 X2 5600+ 2.8 GHz
RAM: 2 GB
GFX: NVIDIA® GeForce® 260 / ATI Radeon™ HD 4870 or better
Here are the minimum requirements for the game
Diablo 3 Minimum System Requirements
PC Requirements
OS: Windows® XP/Windows Vista® / Windows® 7 (Latest Service Packs) with DirectX® 9.0c
CPU: Intel Pentium® D 2.8 GHz / AMD AthlonTM 64 X2 4400+
GFX: NVIDIA® GeForce® 7800 GT or ATI Radeon™ X1950 Pro or better
You meet the minimum requirements for diablo 3, which means you will be able to play it at lowered settings and...