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Differences What are the advantages of each

Front view of Radeon E8870

Reasons to consider the
AMD Radeon E8870

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Higher clock speed 1,000 MHz vs 823 MHz More than 20% higher clock speed
More memory 4,096 MB vs 2,048 MB 2x more memory
Slightly higher memory clock speed 1,500 MHz vs 1,400 MHz More than 5% higher memory clock speed
Lower TDP 75W vs 130W More than 40% lower TDP
Front view of GeForce GTX 660

Reasons to consider the
Nvidia GeForce GTX 660

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Higher memory bandwidth 179.2 GB/s vs 96 GB/s More than 85% higher memory bandwidth
More texture mapping units 96 vs 48 Twice as many texture mapping units
More render output processors 32 vs 16 Twice as many render output processors
Higher texture rate 79 GTexel/s vs 48 GTexel/s Around 65% higher texture rate
More shading units 1,152 vs 768 384 more shading units

Features Key features of the Radeon E8870  vs GeForce GTX 660 

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

Radeon E8870
96 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 E8870
16 GPixel/s
GeForce GTX 660
19.75 GPixel/s

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

Radeon E8870
48 GTexel/s
GeForce GTX 660
79 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon E8870
1,536 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 E8870  vs
GeForce GTX 660 
GPU brand AMD Nvidia
GPU name Saturn GK104
Market Laptop Desktop
Clock speed 1,000 MHz 823 MHz
Is dual GPU No No
Reference card None Nvidia GeForce GTX 660 980 MHz 2 GB

raw performance

Shading units 768 1,152
Texture mapping units 48 96
Render output processors 16 32
Pixel rate 16 GPixel/s 19.75 GPixel/s
Texture rate 48 GTexel/s 79 GTexel/s
Floating-point performance 1,536 GFLOPS 1,896.2 GFLOPS

memory

Radeon E8870  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 128 bit 256 bit
Memory 4,096 MB 2,048 MB
Memory type GDDR5 GDDR5
Memory bandwidth 96 GB/s 179.2 GB/s

noise and power

TDP 75W 130W

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