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Differences What are the advantages of each

Front view of Radeon HD 4870

Reasons to consider the
ATi Radeon HD 4870

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Much higher effective memory clock speed 3,600 MHz vs 800 MHz 4.5x higher effective memory clock speed
Significantly higher memory bandwidth 115.2 GB/s vs 12.8 GB/s 9x higher memory bandwidth
Better PassMark score 1,379 vs 263 Around 5.2x better PassMark score
Higher clock speed 750 MHz vs 600 MHz 25% higher clock speed
Better floating-point performance 1,200 GFLOPS vs 384 GFLOPS Around 3.2x better floating-point performance
Significantly higher memory clock speed 900 MHz vs 400 MHz 2.2x higher memory clock speed
More shading units 800 vs 320 480 more shading units
Slightly higher pixel rate 12 GPixel/s vs 4.8 GPixel/s 2.5x higher pixel rate
Wider memory bus 256 bit vs 128 bit 2x wider memory bus
More render output processors 16 vs 8 Twice as many render output processors
More compute units 10 vs 4 6 more compute units
Front view of Radeon HD 4650 AGP

Reasons to consider the
ATi Radeon HD 4650 AGP

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Significantly lower TDP 48W vs 150W 3.1x lower TDP

Benchmarks Real world tests of Radeon HD 4870 vs 4650 AGP

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the Radeon HD 4870  vs 4650 AGP 

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

Radeon HD 4870
115.2 GB/s
Radeon HD 4650 AGP
12.8 GB/s

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

Radeon HD 4870
12 GPixel/s
Radeon HD 4650 AGP
4.8 GPixel/s

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

Radeon HD 4870
30 GTexel/s
Radeon HD 4650 AGP
19.2 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 4870
1,200 GFLOPS
Radeon HD 4650 AGP

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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