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Differences What are the advantages of each

Front view of Radeon HD 8550M

Reasons to consider the
AMD Radeon HD 8550M

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Higher clock speed 650 MHz vs 500 MHz 30% higher clock speed
Higher effective memory clock speed 1,800 MHz vs 1,200 MHz 50% higher effective memory clock speed
Higher memory clock speed 900 MHz vs 600 MHz 50% higher memory clock speed
Front view of Mobility Radeon HD 4650

Reasons to consider the
ATi Mobility Radeon HD 4650

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Wider memory bus 128 bit vs 64 bit 2x wider memory bus
Slightly more texture mapping units 32 vs 20 12 more texture mapping units

Features Key features of the Radeon HD 8550M  vs Mobility Radeon HD 4650 

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 8550M
6.8 GPixel/s

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

Radeon HD 8550M
17 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 8550M  vs
Mobility Radeon HD 4650 
GPU brand AMD ATI
GPU name Sun M96
Market Laptop Laptop
Clock speed 650 MHz 500 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 320 320
Texture mapping units 20 32
Render output processors 8 8
Compute units 5 4
Pixel rate 6.8 GPixel/s 4 GPixel/s
Texture rate 17 GTexel/s 16 GTexel/s
Floating-point performance 544 GFLOPS 320 GFLOPS

memory

Radeon HD 8550M  vs
Mobility Radeon HD 4650 
Memory clock speed 900 MHz 600 MHz
Effective memory clock speed 1,800 MHz 1,200 MHz
Memory bus 64 bit 128 bit
Memory 1,024 MB 512 MB
Memory type DDR3 DDR2
Memory bandwidth 14.4 GB/s 19.2 GB/s

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