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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 14.4 GB/s Around 4.5x higher memory bandwidth
Better floating-point performance 1,000 GFLOPS vs 115.2 GFLOPS Around 8.8x better floating-point performance
More shading units 800 vs 80 720 more shading units
More render output processors 16 vs 4 12 more render output processors
More texture mapping units 40 vs 8 32 more texture mapping units
More compute units 10 vs 1 9 more compute units
Wider memory bus 256 bit vs 64 bit 4x wider memory bus
Front view of Mobility Radeon HD 5145

Reasons to consider the
ATi Mobility Radeon HD 5145

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Higher clock speed 720 MHz vs 625 MHz More than 15% higher clock speed
Significantly lower TDP 15W vs 110W 7.3x lower TDP

Features Key features of the Radeon HD 4850  vs Mobility Radeon HD 5145 

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
Mobility Radeon HD 5145
2.88 GPixel/s

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

Radeon HD 4850
25 GTexel/s
Mobility Radeon HD 5145
5.76 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


Radeon HD 4850  vs
Mobility Radeon HD 5145 
GPU name RV770 M92
Market Desktop Laptop
Clock speed 625 MHz 720 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 800 80
Texture mapping units 40 8
Render output processors 16 4
Compute units 10 1
Pixel rate 10 GPixel/s 2.88 GPixel/s
Texture rate 25 GTexel/s 5.76 GTexel/s
Floating-point performance 1,000 GFLOPS 115.2 GFLOPS


Radeon HD 4850  vs
Mobility Radeon HD 5145 
Memory clock speed 993 MHz 900 MHz
Effective memory clock speed 1,986 MHz 1,800 MHz
Memory bus 256 bit 64 bit
Memory 512 MB 1,024 MB
Memory type GDDR3 GDDR3
Memory bandwidth 63.55 GB/s 14.4 GB/s

noise and power

TDP 110W 15W


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