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Differences What are the advantages of each

Front view of Radeon HD 8400E

Reasons to consider the
AMD Radeon HD 8400E

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Much lower TDP 25W vs 165W 6.6x lower TDP
Front view of Radeon HD 3870 X2

Reasons to consider the
ATi Radeon HD 3870 X2

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Is dual GPU Yes vs No About half of graphics cards are dual GPU
Higher clock speed 825 MHz vs 600 MHz Around 40% higher clock speed
Higher memory bandwidth 115.32 GB/s vs 8.53 GB/s More than 13.5x higher memory bandwidth
Higher pixel rate 26.4 GPixel/s vs 2.4 GPixel/s 11x higher pixel rate
Significantly more render output processors 32 vs 4 28 more render output processors
Better floating-point performance 1,056 GFLOPS vs 192 GFLOPS 5.5x better floating-point performance
Higher effective memory clock speed 1,802 MHz vs 1,066 MHz Around 70% higher effective memory clock speed
More shading units 640 vs 160 480 more shading units
Higher memory clock speed 901 MHz vs 533 MHz Around 70% higher memory clock speed
More texture mapping units 32 vs 8 24 more texture mapping units
Wider memory bus 512 bit vs 64 bit 8x wider memory bus
Slightly more compute units 8 vs 2 6 more compute units

Benchmarks Real world tests of Radeon HD 8400E vs 3870 X2

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the Radeon HD 8400E  vs 3870 X2 

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

Radeon HD 8400E
8.53 GB/s
Radeon HD 3870 X2
115.32 GB/s

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

Radeon HD 8400E
2.4 GPixel/s
Radeon HD 3870 X2
26.4 GPixel/s

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

Radeon HD 8400E
4.8 GTexel/s
Radeon HD 3870 X2
26.4 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 8400E
192 GFLOPS
Radeon HD 3870 X2
1,056 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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