The i5 2500K features the HD 2000 graphics from Intel.. It is a little inferior compared to the HD 3000.. Both feature DX 10.1 support.. However, the HD 2000 has lower number of execution units compared to the HD 3000.. Both solutions are massive improvements over previous Intel onboard graphics solutions however, are inadequate for any serious gaming..
Instead of worrying about whether you are getting HD 2000 or HD 3000, why dont you tell people how you are planning on using your new CPU. As Emperus said, none of the Intel integrated gpus are capable of any level of serious gaming, but they are just fine for Windows, browsing, watching movies and anything else...
The Intel HD 3000 is a pretty good step up from their previous integrated video solution. The following review shows it outperforming the Radeon HD 5450. It only losses to the HD 5450 in HAWX 2 and Starcraft.
It seems Crysis Warhead is playable using low graphics quality. But barely playable for Metro 2033.