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Differences What are the advantages of each

Front view of Radeon HD 4850

Reasons to consider the
ATi Radeon HD 4850

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Higher memory bandwidth 63.55 GB/s vs 25.28 GB/s More than 2.5x higher memory bandwidth
More shading units 800 vs 320 480 more shading units
More render output processors 16 vs 8 Twice as many render output processors
Higher memory clock speed 993 MHz vs 790 MHz More than 25% higher memory clock speed
More compute units 10 vs 4 6 more compute units
Front view of Mobility Radeon HD 4670 Mac

Reasons to consider the
ATi Mobility Radeon HD 4670 Mac

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Lower TDP 35W vs 110W 3.1x lower TDP

Features Key features of the Radeon HD 4850  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 4850
10 GPixel/s

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

Radeon HD 4850
25 GTexel/s

floating point performance How fast the gpu can crunch numbers

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 4850  vs
Mobility Radeon HD 4670 Mac 
GPU brand ATI ATI
GPU name RV770 M96
Market Desktop Laptop
Clock speed 625 MHz 680 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 800 320
Texture mapping units 40 32
Render output processors 16 8
Compute units 10 4
Pixel rate 10 GPixel/s 5.44 GPixel/s
Texture rate 25 GTexel/s 21.76 GTexel/s
Floating-point performance 1,000 GFLOPS 435.2 GFLOPS

memory

Radeon HD 4850  vs
Mobility Radeon HD 4670 Mac 
Memory clock speed 993 MHz 790 MHz
Effective memory clock speed 1,986 MHz 1,580 MHz
Memory bus 256 bit 128 bit
Memory 512 MB 256 MB
Memory type GDDR3 GDDR3
Memory bandwidth 63.55 GB/s 25.28 GB/s

noise and power

TDP 110W 35W

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