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Differences What are the advantages of each

Front view of Radeon Sky 500

Reasons to consider the
AMD Radeon Sky 500

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More memory 4,096 MB vs 2,048 MB 2x more memory
Lower TDP 150W vs 195W Around 25% lower TDP
Front view of GeForce GTX 680

Reasons to consider the
Nvidia GeForce GTX 680

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Higher effective memory clock speed 6,008 MHz vs 4,800 MHz More than 25% higher effective memory clock speed
Higher texture rate 128.8 GTexel/s vs 76 GTexel/s Around 70% higher texture rate
Higher memory bandwidth 192.3 GB/s vs 153.6 GB/s More than 25% higher memory bandwidth
More texture mapping units 128 vs 80 48 more texture mapping units
Higher memory clock speed 1,502 MHz vs 1,200 MHz More than 25% higher memory clock speed

Features Key features of the Radeon Sky 500  vs GeForce GTX 680 

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

Radeon Sky 500
153.6 GB/s
GeForce GTX 680
192.3 GB/s

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

Radeon Sky 500
30.4 GPixel/s
GeForce GTX 680
32.2 GPixel/s

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

Radeon Sky 500
76 GTexel/s
GeForce GTX 680
128.8 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon Sky 500
2,432 GFLOPS
GeForce GTX 680
3,090.4 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 Sky 500  vs
GeForce GTX 680 
GPU brand AMD Nvidia
GPU name Pitcairn GK104
Clock speed 950 MHz 1,006 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 1,280 1,536
Texture mapping units 80 128
Render output processors 32 32
Pixel rate 30.4 GPixel/s 32.2 GPixel/s
Texture rate 76 GTexel/s 128.8 GTexel/s
Floating-point performance 2,432 GFLOPS 3,090.4 GFLOPS

memory

Radeon Sky 500  vs
GeForce GTX 680 
Memory clock speed 1,200 MHz 1,502 MHz
Effective memory clock speed 4,800 MHz 6,008 MHz
Memory bus 256 bit 256 bit
Memory 4,096 MB 2,048 MB
Memory type GDDR5 GDDR5
Memory bandwidth 153.6 GB/s 192.3 GB/s

noise and power

TDP 150W 195W

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