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AMD Radeon HD 7870

22 CUs 1408 GCN Stream processors

88 TMUs, 24 ROPs (de-linked from memory bus)

2 GB GDDR5 memory, 256-bit bus

950 MHz Core Clock

1375 MHz (5.50 GHz effective) memory clock

AMD Radeon HD 7850

20 CUs 1280 GCN Stream processors

80 TMUs, 24 ROPs (de-linked from memory bus)

1 GB or 2GB GDDR5 memory, 256-bit bus

900 MHz Core Clock

1250 MHz (5.00 Ghz effective) memory clock