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Differences What are the advantages of each

Front view of Radeon HD 8870

Reasons to consider the
AMD Radeon HD 8870

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Better floating-point performance 3,789 GFLOPS vs 1,896.2 GFLOPS Around 2x better floating-point performance
Higher clock speed 925 MHz vs 823 MHz More than 10% higher clock speed
Higher texture rate 118.4 GTexel/s vs 79 GTexel/s Around 50% higher texture rate
Significantly more shading units 2,048 vs 1,152 896 more shading units
Higher effective memory clock speed 6,000 MHz vs 5,600 MHz More than 5% higher effective memory clock speed
Higher pixel rate 29.6 GPixel/s vs 19.75 GPixel/s Around 50% higher pixel rate
More texture mapping units 128 vs 96 32 more texture mapping units
Higher turbo clock speed 975 MHz vs 888 MHz Around 10% higher turbo clock speed
Higher memory clock speed 1,500 MHz vs 1,400 MHz More than 5% higher memory clock speed
Front view of GeForce GTX 660

Reasons to consider the
Nvidia GeForce GTX 660

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Lower TDP 130W vs 185W Around 30% lower TDP

Features Key features of the Radeon HD 8870  vs GeForce GTX 660 

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

Radeon HD 8870
192 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 HD 8870
29.6 GPixel/s
GeForce GTX 660
19.75 GPixel/s

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

Radeon HD 8870
118.4 GTexel/s
GeForce GTX 660
79 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 8870
3,789 GFLOPS
GeForce GTX 660
1,896.2 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

Specifications Full list of technical specs

gpu

Radeon HD 8870  vs
GeForce GTX 660 
GPU brand AMD Nvidia
GPU name Hainan XT GK104
Market Desktop Desktop
Clock speed 925 MHz 823 MHz
Turbo clock speed 975 MHz 888 MHz
Is dual GPU No No
Reference card None Nvidia GeForce GTX 660 980 MHz 2 GB

raw performance

Shading units 2,048 1,152
Texture mapping units 128 96
Render output processors 32 32
Pixel rate 29.6 GPixel/s 19.75 GPixel/s
Texture rate 118.4 GTexel/s 79 GTexel/s
Floating-point performance 3,789 GFLOPS 1,896.2 GFLOPS

memory

Radeon HD 8870  vs
GeForce GTX 660 
Memory clock speed 1,500 MHz 1,400 MHz
Effective memory clock speed 6,000 MHz 5,600 MHz
Memory bus 256 bit 256 bit
Memory 2,048 MB 2,048 MB
Memory type GDDR5 GDDR5
Memory bandwidth 192 GB/s 179.2 GB/s

noise and power

TDP 185W 130W

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