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Differences What are the advantages of each

Front view of Radeon HD 6990M

Reasons to consider the
AMD Radeon HD 6990M

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Slightly higher memory bandwidth 115.2 GB/s vs 96.2 GB/s Around 20% higher memory bandwidth
Higher pixel rate 22.88 GPixel/s vs 14.12 GPixel/s More than 60% higher pixel rate
More render output processors 32 vs 24 8 more render output processors
Wider memory bus 256 bit vs 192 bit Around 35% wider memory bus
Front view of GeForce GTX 770M

Reasons to consider the
Nvidia GeForce GTX 770M

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More memory 3,072 MB vs 2,048 MB 50% more memory
Slightly higher texture rate 56.5 GTexel/s vs 40 GTexel/s More than 40% higher texture rate
More texture mapping units 80 vs 56 24 more texture mapping units
Higher memory clock speed 1,002 MHz vs 900 MHz More than 10% higher memory clock speed
Lower TDP 75W vs 100W 25% lower TDP

Benchmarks Real world tests of Radeon HD 6990M vs GeForce GTX 770M

Battlefield 3

Features Key features of the Radeon HD 6990M  vs GeForce GTX 770M 

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

Radeon HD 6990M
115.2 GB/s
GeForce GTX 770M
96.2 GB/s

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

Radeon HD 6990M
22.88 GPixel/s
GeForce GTX 770M
14.12 GPixel/s

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

Radeon HD 6990M
40 GTexel/s
GeForce GTX 770M
56.5 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6990M
1,601.6 GFLOPS
GeForce GTX 770M
1,355.5 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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