HD i7 2720QM is a specific version of the Intel HD 3000 Graphics that comes with the CPU 'Core i7-2720QM 4-Core 2.2GHz'. It uses the CPU's Level 3 Cache (up to 6 MB, in this case) + part of the RAM installed on the system up to a maximum of approximately 1.7GB for Vista/7 and 1 GB for XP. The Memory controller supports DDR3-1066 and DDR3-1333 and the Turbo Boost technology of the processor can over-clock the graphics card clock from 650MHz to 1300MHz.
Nevertheless it's still an integrated GPU with shared memory so its performance is very limited. Still, demanding games like Crysis 2 should still run on the lowest settings.