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Differences What are the advantages of each

Front view of Radeon HD 7770

Reasons to consider the
AMD Radeon HD 7770

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Significantly higher clock speed 1,000 MHz vs 600 MHz More than 65% higher clock speed
Significantly higher effective memory clock speed 4,500 MHz vs 1,800 MHz 2.5x higher effective memory clock speed
Higher memory bandwidth 72 GB/s vs 28.8 GB/s 2.5x higher memory bandwidth
Higher pixel rate 16 GPixel/s vs 4.8 GPixel/s More than 3.2x higher pixel rate
Slightly higher texture rate 40 GTexel/s vs 14.4 GTexel/s More than 2.8x higher texture rate
More render output processors 16 vs 8 Twice as many render output processors
Better PassMark direct compute score 1,403 vs 378 Around 3.8x better PassMark direct compute score
Higher memory clock speed 1,125 MHz vs 900 MHz 25% higher memory clock speed
Front view of Radeon HD 6650A

Reasons to consider the
AMD Radeon HD 6650A

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Lower TDP 45W vs 80W Around 45% lower TDP

Benchmarks Real world tests of Radeon HD 7770 vs 6650A

PassMark Direct Compute Measures performance of general-purpose computing using Microsoft DirectCompute

Features Key features of the Radeon HD 7770  vs 6650A 

memory bandwidth Rate at which data can be read from or stored in onboard memory

Radeon HD 7770
72 GB/s
Radeon HD 6650A
28.8 GB/s

pixel rate Number of pixels a graphics card can render to the screen every second

Radeon HD 7770
16 GPixel/s
Radeon HD 6650A
4.8 GPixel/s

texture rate Speed at which a graphics card can perform texture mapping

Radeon HD 7770
40 GTexel/s
Radeon HD 6650A
14.4 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 7770
1,280 GFLOPS
Radeon HD 6650A
576 GFLOPS

shading units Subcomponents of the gpu, these run in parallel to enable fast pixel shading

texture mapping units Built into each gpu, these resize and rotate bitmaps for texturing scenes

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