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Differences What are the advantages of each

Front view of Radeon R7 250

Reasons to consider the
Generic Radeon R7 250

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Significantly higher clock speed 1,000 MHz vs 823 MHz More than 20% higher clock speed
Higher turbo clock speed 1,050 MHz vs 888 MHz Around 20% higher turbo clock speed
Lower TDP 65W vs 130W 2x lower TDP
Front view of GeForce GTX 660

Reasons to consider the
Nvidia GeForce GTX 660

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Significantly higher memory bandwidth 179.2 GB/s vs 73.6 GB/s Around 2.5x higher memory bandwidth
Higher effective memory clock speed 5,600 MHz vs 4,600 MHz More than 20% higher effective memory clock speed
Higher texture rate 79 GTexel/s vs 24 GTexel/s More than 3.2x higher texture rate
More memory 2,048 MB vs 1,024 MB 2x more memory
Better floating-point performance 1,896 GFLOPS vs 768 GFLOPS Around 2.5x better floating-point performance
Significantly higher FarCry 3 framerate 80 vs 52.5 More than 50% higher FarCry 3 framerate
More texture mapping units 96 vs 24 72 more texture mapping units
Higher pixel rate 19.8 GPixel/s vs 8 GPixel/s Around 2.5x higher pixel rate
More shading units 1,152 vs 384 Three times as many shading units
More render output processors 32 vs 16 Twice as many render output processors
Higher memory clock speed 1,400 MHz vs 1,150 MHz More than 20% higher memory clock speed

Benchmarks Real world tests of Radeon R7 250 vs GeForce GTX 660

FarCry 3

Features Key features of the Radeon R7 250  vs GeForce GTX 660 

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

Radeon R7 250
73.6 GB/s
GeForce GTX 660
179.2 GB/s

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

Radeon R7 250
8 GPixel/s
GeForce GTX 660
19.8 GPixel/s

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

Radeon R7 250
24 GTexel/s
GeForce GTX 660
79 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon R7 250
768 GFLOPS
GeForce GTX 660
1,896 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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