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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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Wider memory bus 128 bit vs 64 bit 2x wider memory bus
Front view of GeForce GT 640M Mac

Reasons to consider the
Nvidia GeForce GT 640M Mac

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Higher clock speed 745 MHz vs 598 MHz Around 25% higher clock speed
Higher effective memory clock speed 5,000 MHz vs 3,176 MHz More than 55% higher effective memory clock speed
Significantly higher memory clock speed 1,250 MHz vs 794 MHz More than 55% higher memory clock speed

Features Key features of the Radeon HD 6750M Mac  vs GeForce GT 640M 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
GeForce GT 640M Mac
5.96 GPixel/s

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

Radeon HD 6750M Mac
14.35 GTexel/s
GeForce GT 640M Mac
23.84 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6750M Mac
574.1 GFLOPS
GeForce GT 640M Mac
572.2 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 6750M Mac  vs
GeForce GT 640M Mac 
GPU brand AMD Nvidia
GPU name Whistler GK107
Market Laptop Laptop
Clock speed 598 MHz 745 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 480 384
Texture mapping units 24 32
Render output processors 8 8
Pixel rate 4.78 GPixel/s 5.96 GPixel/s
Texture rate 14.35 GTexel/s 23.84 GTexel/s
Floating-point performance 574.1 GFLOPS 572.2 GFLOPS

memory

Radeon HD 6750M Mac  vs
GeForce GT 640M Mac 
Memory clock speed 794 MHz 1,250 MHz
Effective memory clock speed 3,176 MHz 5,000 MHz
Memory bus 128 bit 64 bit
Memory 512 MB 512 MB
Memory type GDDR5 GDDR5
Memory bandwidth 50.8 GB/s 40 GB/s

noise and power

TDP 35W 32W

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