Intel HD Graphics Mobile Game Requirement Analysis
Intel HD Graphics Mobile is an integrated GPU in the Arrandale CPUs released by Intel.
It can have up to ~1.7GB of system RAM. The CPU's highest memory supported is 1066MHz. Therefore, the max memory clock is 533MHz.
The performance depends a lot from CPU to CPU, as it can come clocked at different speeds and reach different values using Turbo Boost.
Identify your CPU and see if the specific version of this Intel that comes with your CPU is added. Example: if you have the CPU Core i7-620M, you have the GPU HD i7 M620.