On the example of the reference ATI RADEON HD 3870 512MB DDR4 (775/2250 MHz).

Features:

• ATI RADEON HD 3870 GPU, 775 MHz
• Pixel processors: -
• Vertex processors: -
• Unified processors: 320
• Texture processors: 16
• ROPs: 16
• 512MB GDDR4 SDRAM in 8 Samsung chips; 0.8ns fetch, 1125 (2250) MHz default memory clock
• 256-bit bus
• Supports DX10