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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 effective memory clock speed 3,176 MHz vs 1,580 MHz More than 2x higher effective memory clock speed
Higher memory bandwidth 50.8 GB/s vs 25.28 GB/s More than 2x higher memory bandwidth
Front view of Mobility Radeon HD 4670 Mac

Reasons to consider the
ATi Mobility Radeon HD 4670 Mac

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Higher clock speed 680 MHz vs 598 MHz Around 15% higher clock speed

Features Key features of the Radeon HD 6750M Mac  vs Mobility Radeon HD 4670 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

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

Radeon HD 6750M Mac
14.35 GTexel/s

floating point performance How fast the gpu can crunch numbers

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
Mobility Radeon HD 4670 Mac 
GPU brand AMD ATI
GPU name Whistler M96
Market Laptop Laptop
Clock speed 598 MHz 680 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 480 320
Texture mapping units 24 32
Render output processors 8 8
Compute units 6 4
Pixel rate 4.78 GPixel/s 5.44 GPixel/s
Texture rate 14.35 GTexel/s 21.76 GTexel/s
Floating-point performance 574.1 GFLOPS 435.2 GFLOPS

memory

Radeon HD 6750M Mac  vs
Mobility Radeon HD 4670 Mac 
Memory clock speed 794 MHz 790 MHz
Effective memory clock speed 3,176 MHz 1,580 MHz
Memory bus 128 bit 128 bit
Memory 512 MB 256 MB
Memory type GDDR5 GDDR3
Memory bandwidth 50.8 GB/s 25.28 GB/s

noise and power

TDP 35W 35W

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