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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 800 MHz 25% higher clock speed
Better floating-point performance 1,280 GFLOPS vs 614.4 GFLOPS More than 2x better floating-point performance
Higher pixel rate 16 GPixel/s vs 6.4 GPixel/s Around 2.5x higher pixel rate
Higher texture rate 40 GTexel/s vs 19.2 GTexel/s More than 2x higher texture rate
More render output processors 16 vs 8 Twice as many render output processors
Better CLBenchmark raytrace score 105,396 vs 56,993 Around 85% better CLBenchmark raytrace score
Front view of Radeon HD 7730

Reasons to consider the
AMD Radeon HD 7730

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Lower TDP 47W vs 80W More than 40% lower TDP

Benchmarks Real world tests of Radeon HD 7770 vs 7730

CLBenchmark Raytrace Measures compute performance using OpenCL to do raytracing

Features Key features of the Radeon HD 7770  vs 7730 

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

Radeon HD 7770
72 GB/s
Radeon HD 7730
72 GB/s
It features a 128-bit wide GDDR5 memory interface, with which it communicates with 1 GB of memory.
Radeon HD 7770 | by techPowerUp! (Feb, 2012)

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

Radeon HD 7770
16 GPixel/s
Radeon HD 7730
6.4 GPixel/s
You may combine up to two HD 7770 cards from any vendor in a multi-GPU CrossFire configuration for higher framerates or better image quality settings.
Radeon HD 7770 | by techPowerUp! (Feb, 2012)

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

Radeon HD 7770
40 GTexel/s
Radeon HD 7730
19.2 GTexel/s
Even though Vapor-X was engineered for high-end cards, the company's exclusive cooling technology can really show its potential on this lower-midrange card.
Radeon HD 7770 | by techPowerUp! (May, 2012)

floating point performance How fast the gpu can crunch numbers

Radeon HD 7770
1,280 GFLOPS
Radeon HD 7730
614.4 GFLOPS

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

AMD's Cape Verde graphics processor introduced a new shader architecture, it is also the second GPU to be produced on a 28 nm process at TSMC.
Radeon HD 7770 | by techPowerUp! (May, 2012)

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

The graphic card features 384 stream processors with 16 ROPs and 24 TMUs and is essentially a cut down variant of the Cape Verde GPU hence called “Cape Verde LE.
Radeon HD 7730 | by hassan-mujtaba (Jul, 2013)

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