Radeon HD 8370D is an embedded Graphics Card on the low end Richland APUs like the A4-6300, A4-6320
They offer 128 Shader Processing Units, 8 TMUs and 4 ROPs. The memory interface depends on whether or not the system's RAM is dual channelled.
While the central unit runs at 760MHz, since the GFX doesn't have dedicated memory, the bandwidth will depend on the system ram speed which can be up to 2133MHz (the max speed supported by the CPU). Therefore, the max boost clock is 844MHz.
Th graphical performance is not top end by todays integrated graphics standards