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Differences What are the advantages of each

Front view of Radeon HD 7730

Reasons to consider the
AMD Radeon HD 7730

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Higher effective memory clock speed 4,500 MHz vs 4,000 MHz Around 15% higher effective memory clock speed
Higher memory clock speed 1,125 MHz vs 1,000 MHz Around 15% higher memory clock speed
Front view of GeForce GTX 645

Reasons to consider the
Nvidia GeForce GTX 645

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Higher texture rate 39.5 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
More texture mapping units 48 vs 24 Twice as many texture mapping units

Benchmarks Real world tests of Radeon HD 7730 vs GeForce GTX 645

CLBenchmark Raytrace Measures compute performance using OpenCL to do raytracing

Features Key features of the Radeon HD 7730  vs GeForce GTX 645 

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

Before you try too hard to compare the number of shaders, texture units, ROPs, and memory bandwidth to AMD's Radeon HD 6670, remember that both GPUs leverage different architectures.
Radeon HD 7730 | by Don-Woligroski (Aug, 2013)

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

Radeon HD 7730
6.4 GPixel/s
GeForce GTX 645
9.88 GPixel/s
The card being a low-end model has a short PCB design and features nothing fancy other than the propeller blade cooling solution from MSI.
Radeon HD 7730 | by hassan-mujtaba (Jul, 2013)

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

Radeon HD 7730
19.2 GTexel/s
GeForce GTX 645
39.5 GTexel/s
The main number we're on the hung for is 60 when it comes to looking at our average FPS.
Radeon HD 7730 | by Shawn-Baker (Aug, 2013)

floating point performance How fast the gpu can crunch numbers

Radeon HD 7730
614.4 GFLOPS
GeForce GTX 645
948.1 GFLOPS

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

So, while the 7730 comes up short against the 6670's shader count, we aren't expecting it to be slower.
Radeon HD 7730 | by Don-Woligroski (Aug, 2013)

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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