Radeon R7 7800 is an integrated Graphics Card in the A10-7800.
It is based on the Graphics Core Next Architecture and offers 512 Shader Processing Units, 32 TMUs and 8 ROPs. The memory bus-width will depend on whether or not the system's RAM is dual-channeled and the operating memory clock, on its frequency. Thus, it can be either 64-bit or 128-bit and up to 933MHz.
Therefore, the Graphics Card's performance depends a lot on the system configuration. Best case scenario, expect performance similar to a dedicated GeForce GT 730M.
The card is thus suited for 720p gaming and some modern demanding games can be played at least on medium settings.