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Differences What are the advantages of each

Front view of Radeon HD 6970M Mac

Reasons to consider the
AMD Radeon HD 6970M Mac

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Higher effective memory clock speed 3,600 MHz vs 1,986 MHz More than 80% higher effective memory clock speed
More memory 2,048 MB vs 512 MB 4x more memory
Higher memory bandwidth 115.2 GB/s vs 63.55 GB/s More than 80% higher memory bandwidth
Higher pixel rate 21.76 GPixel/s vs 10 GPixel/s Around 2.2x higher pixel rate
More render output processors 32 vs 16 Twice as many render output processors
Lower TDP 75W vs 110W More than 30% lower TDP
Front view of Radeon HD 4850

Reasons to consider the
ATi Radeon HD 4850

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Slightly higher memory clock speed 993 MHz vs 900 MHz More than 10% higher memory clock speed

Features Key features of the Radeon HD 6970M Mac  vs 4850 

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

Radeon HD 6970M Mac
115.2 GB/s
Radeon HD 4850
63.55 GB/s

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

Radeon HD 6970M Mac
21.76 GPixel/s
Radeon HD 4850
10 GPixel/s

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

Radeon HD 6970M Mac
32.6 GTexel/s
Radeon HD 4850
25 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6970M Mac
1,305.6 GFLOPS
Radeon HD 4850
1,000 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 6970M Mac  vs
4850 
GPU brand AMD ATI
GPU name Blackcomb RV770
Market Laptop Desktop
Clock speed 680 MHz 625 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 960 800
Texture mapping units 48 40
Render output processors 32 16
Compute units 12 10
Pixel rate 21.76 GPixel/s 10 GPixel/s
Texture rate 32.6 GTexel/s 25 GTexel/s
Floating-point performance 1,305.6 GFLOPS 1,000 GFLOPS

memory

Radeon HD 6970M Mac  vs
4850 
Memory clock speed 900 MHz 993 MHz
Effective memory clock speed 3,600 MHz 1,986 MHz
Memory bus 256 bit 256 bit
Memory 2,048 MB 512 MB
Memory type GDDR5 GDDR3
Memory bandwidth 115.2 GB/s 63.55 GB/s

noise and power

TDP 75W 110W

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