Intel HD Graphics Desktop (Bay Trail) are integrated graphics in the low-end Atoms and nettop processors.

Their performance depends on the processor they are integrated on, as the latter defines the Base and Boost Clock, as well as on the SYSTEM RAM, which defines the operating memory clock, and whether the GPU accesses a 64-bit or 128-bit memory interface.
The Graphics Card also shares the processor's L2 Cache of 4MB. Therefore, it reduces the need to resort to its memory bandwidth.

Best case scenario, the Intel HD Graphics Desktop (Bay Trail) perform only slightly below the Intel HD 2000 Graphics and so most modern demanding games will have to be played with the lowest settings, while some aren't even playable.