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Differences What are the advantages of each

Front view of Radeon HD 7790

Reasons to consider the
AMD Radeon HD 7790

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Significantly higher clock speed 1,000 MHz vs 750 MHz Around 35% higher clock speed
Much higher effective memory clock speed 6,000 MHz vs 1,600 MHz 3.8x higher effective memory clock speed
Better passmark score 3,007 vs 543 More than 5.5x better passmark score
Better floating-point performance 1,792 GFLOPS vs 480 GFLOPS Around 3.8x better floating-point performance
Higher memory bandwidth 96 GB/s vs 25.6 GB/s 3.8x higher memory bandwidth
Much higher memory clock speed 1,500 MHz vs 800 MHz Around 90% higher memory clock speed
More memory 1,024 MB vs 512 MB 2x more memory
Higher texture rate 56 GTexel/s vs 24 GTexel/s More than 2.2x higher texture rate
Higher pixel rate 16 GPixel/s vs 6 GPixel/s Around 2.8x higher pixel rate
More shading units 896 vs 320 576 more shading units
More compute units 14 vs 4 10 more compute units
More render output processors 16 vs 8 Twice as many render output processors
More texture mapping units 56 vs 32 24 more texture mapping units
Front view of Radeon HD 4670

Reasons to consider the
ATi Radeon HD 4670

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Slightly lower TDP 59W vs 85W More than 30% lower TDP

Benchmarks Real world tests of Radeon HD 7790 vs 4670

Passmark Industry standard benchmark for overall graphics card performance

Features Key features of the Radeon HD 7790  vs 4670 

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

Radeon HD 7790
96 GB/s
Radeon HD 4670
25.6 GB/s

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

Radeon HD 7790
16 GPixel/s
Radeon HD 4670
6 GPixel/s

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

Radeon HD 7790
56 GTexel/s
Radeon HD 4670
24 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 7790
1,792 GFLOPS
Radeon HD 4670
480 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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