PC RequirementsPC Minimum System Requirements*: * Windows® XP/Windows Vista®/Windows® 7 (Updated with the 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
* 12 GB available HD space
* 1 GB RAM (1.5 GB required for Windows Vista®/Windows® 7 users)
* DVD-ROM drive
* Broadband Internet connection
* 1024X720 minimum display resolution
PC Recommended Specifications: * 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
*Note: Due to potential programming changes, the Minimum System Requirements for this game may change over time.Mac RequirementsMac Minimum System Requirements: * Mac® OS X 10.5.8, 10.6.2 or newer
* Intel® Processor
* NVIDIA® GeForce® 8600M GT or ATI Radeon® X1600 or better
* 12 GB available HD space
* 2 GB Ram
* DVD-ROM drive
* Broadband Internet connection
* 1024X720 minimum display resolution
Mac Recommended Specifications: * Intel® Core 2 Duo processor
* 4 GB system RAM
* NVIDIA® GeForce® 9600M GT or ATI Radeon® HD 4670 or better
From:
http://us.blizzard.com/support/article.xml?articleId=26242&locale=en_USSo does my graphics card meet the requirements?!

You want your graphics card to be above the minimum graphics card blizzard requires
listed above. (Note: You still need to make sure the rest of your pc meets the required specs
listed above)
(follow the link and you can ctrl+f to find your graphics card)
Graph from:
http://www.tomshardware.com/reviews/graphics-card-geforce-radeon,2646-7.html