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Differences What are the advantages of each

Front view of Radeon R5 235X

Reasons to consider the
AMD Radeon R5 235X

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Higher clock speed 875 MHz vs 750 MHz More than 15% higher clock speed
Significantly lower TDP 18W vs 150W 8.3x lower TDP
Front view of Radeon HD 4870

Reasons to consider the
ATi Radeon HD 4870

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Significantly higher memory bandwidth 115.2 GB/s vs 14.4 GB/s 8x higher memory bandwidth
Significantly higher effective memory clock speed 3,600 MHz vs 1,800 MHz 2x higher effective memory clock speed
Better PassMark score 1,379 vs 370 Around 3.8x better PassMark score
Better floating-point performance 1,200 GFLOPS vs 280 GFLOPS More than 4.2x better floating-point performance
More shading units 800 vs 160 640 more shading units
Higher texture rate 30 GTexel/s vs 7 GTexel/s More than 4.2x higher texture rate
Significantly wider memory bus 256 bit vs 64 bit 4x wider memory bus
More texture mapping units 40 vs 8 32 more texture mapping units
More render output processors 16 vs 4 12 more render output processors
Higher pixel rate 12 GPixel/s vs 3.5 GPixel/s Around 3.5x higher pixel rate
More compute units 10 vs 2 8 more compute units

Benchmarks Real world tests of Radeon R5 235X vs HD 4870

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the Radeon R5 235X  vs HD 4870 

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

Radeon R5 235X
14.4 GB/s
Radeon HD 4870
115.2 GB/s

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

Radeon R5 235X
3.5 GPixel/s
Radeon HD 4870
12 GPixel/s

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

Radeon R5 235X
7 GTexel/s
Radeon HD 4870
30 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon R5 235X
280 GFLOPS
Radeon HD 4870
1,200 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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