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Differences What are the advantages of each

Front view of Radeon HD 6750M Mac

Reasons to consider the
AMD Radeon HD 6750M Mac

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Higher memory bandwidth 50.8 GB/s vs 25.41 GB/s Around 2x higher memory bandwidth
More shading units 480 vs 160 Three times as many shading units
Wider memory bus 128 bit vs 64 bit 2x wider memory bus
More texture mapping units 24 vs 8 Three times as many texture mapping units
More compute units 6 vs 2 Three times as many compute units
Front view of Radeon HD 6490M Mac

Reasons to consider the
AMD Radeon HD 6490M Mac

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Higher clock speed 750 MHz vs 598 MHz More than 25% higher clock speed

Features Key features of the Radeon HD 6750M Mac  vs 6490M Mac 

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

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

Radeon HD 6750M Mac
4.78 GPixel/s
Radeon HD 6490M Mac
3 GPixel/s

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

Radeon HD 6750M Mac
14.35 GTexel/s
Radeon HD 6490M Mac
6 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6750M Mac
574.1 GFLOPS
Radeon HD 6490M Mac
240 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 6750M Mac  vs
6490M Mac 
GPU brand AMD AMD
GPU name Whistler Seymour
Market Laptop Laptop
Clock speed 598 MHz 750 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 480 160
Texture mapping units 24 8
Render output processors 8 4
Compute units 6 2
Pixel rate 4.78 GPixel/s 3 GPixel/s
Texture rate 14.35 GTexel/s 6 GTexel/s
Floating-point performance 574.1 GFLOPS 240 GFLOPS

memory

Radeon HD 6750M Mac  vs
6490M Mac 
Memory clock speed 794 MHz 794 MHz
Effective memory clock speed 3,176 MHz 3,176 MHz
Memory bus 128 bit 64 bit
Memory 512 MB 256 MB
Memory type GDDR5 GDDR5
Memory bandwidth 50.8 GB/s 25.41 GB/s

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