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Differences What are the advantages of each

Front view of Radeon HD 6770M Mac

Reasons to consider the
AMD Radeon HD 6770M Mac

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Higher clock speed 725 MHz vs 500 MHz 45% higher clock speed
Higher effective memory clock speed 3,600 MHz vs 1,700 MHz More than 2x higher effective memory clock speed
Front view of Mobility Radeon HD 4850

Reasons to consider the
ATi Mobility Radeon HD 4850

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Significantly wider memory bus 256 bit vs 128 bit 2x wider memory bus
More shading units 800 vs 480 320 more shading units
More render output processors 16 vs 8 Twice as many render output processors
More texture mapping units 40 vs 24 16 more texture mapping units
More compute units 10 vs 6 4 more compute units

Features Key features of the Radeon HD 6770M Mac  vs Mobility Radeon HD 4850 

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

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

Radeon HD 6770M Mac
17.4 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 6770M Mac  vs
Mobility Radeon HD 4850 
GPU brand AMD ATI
GPU name Whistler M98
Market Laptop Laptop
Clock speed 725 MHz 500 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 480 800
Texture mapping units 24 40
Render output processors 8 16
Compute units 6 10
Pixel rate 5.8 GPixel/s 8 GPixel/s
Texture rate 17.4 GTexel/s 20 GTexel/s
Floating-point performance 696 GFLOPS 800 GFLOPS

memory

Radeon HD 6770M Mac  vs
Mobility Radeon HD 4850 
Memory clock speed 900 MHz 850 MHz
Effective memory clock speed 3,600 MHz 1,700 MHz
Memory bus 128 bit 256 bit
Memory 512 MB 1,024 MB
Memory type GDDR5 GDDR3
Memory bandwidth 57.6 GB/s 54.4 GB/s

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