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Differences What are the advantages of each

Front view of Radeon R7 340

Reasons to consider the
AMD Radeon R7 340

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More memory 2,048 MB vs 1,024 MB 2x more memory
Significantly lower TDP 50W vs 165W 3.3x 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
Significantly higher memory bandwidth 115.32 GB/s vs 28.8 GB/s More than 4x higher memory bandwidth
Higher clock speed 825 MHz vs 730 MHz Around 15% higher clock speed
Much wider memory bus 512 bit vs 128 bit 4x wider memory bus
Higher pixel rate 26.4 GPixel/s vs 6.24 GPixel/s Around 4.2x higher pixel rate
Significantly more render output processors 32 vs 8 24 more render output processors
Slightly better floating-point performance 1,056 GFLOPS vs 599 GFLOPS More than 75% better floating-point performance
More shading units 640 vs 384 256 more shading units

Benchmarks Real world tests of Radeon R7 340 vs HD 3870 X2

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the Radeon R7 340  vs HD 3870 X2 

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

Radeon R7 340
28.8 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 R7 340
6.24 GPixel/s
Radeon HD 3870 X2
26.4 GPixel/s

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

Radeon R7 340
18.72 GTexel/s
Radeon HD 3870 X2
26.4 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon R7 340
599 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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