Here are the Starcraft 2 System Requirements. Good news for people who don't have very latest hardware, Starcraft 2 is forgiving with it's requirements!
Starcraft 2 System Requirements:
Minimum System Requirements*:
PC: Windows XP/Windows Vista/Windows 7 (Latest Service Packs) with DirectX 9.0c
2.6 GHz Pentium IV or equivalent AMD Athlon processor
128 MB PCIe NVIDIA GeForce 6600 GT or ATI Radeon 9800 PRO video card or better
Mac: Mac OS X 10.5.8, 10.6.2 or newer
Intel Processor
NVIDIA GeForce 8600M GT or ATI Radeon X1600 or better
PC/Mac: 12 GB available HD space
1 GB RAM (1.5 GB required for Windows Vista/Windows 7 users, 2 GB for Mac users)
DVD-ROM drive
Broadband Internet connection
1024X720 minimum display resolution
*Note: Due to potential programming changes, the Minimum System Requirements for this game may change over time.
Recommended System Requirements:
PC: Windows Vista/Windows 7
Dual Core 2.4Ghz Processor
2 GB RAM
512 MB NVIDIA GeForce 8800 GTX or ATI Radeon HD 3870 or better
Mac: Intel Core 2 Duo processor
4 GB system RAM
NVIDIA GeForce 9600M GT or ATI Radeon HD 4670 or better