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Differences What are the advantages of each

Front view of Radeon HD 3550

Reasons to consider the
ATi Radeon HD 3550

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Slightly lower TDP 30W vs 45W Around 35% lower TDP
Front view of Radeon HD 2600 XT Mac

Reasons to consider the
ATi Radeon HD 2600 XT Mac

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Higher clock speed 700 MHz vs 594 MHz Around 20% higher clock speed
Higher effective memory clock speed 1,600 MHz vs 792 MHz More than 2x higher effective memory clock speed
Higher memory bandwidth 25.6 GB/s vs 6.34 GB/s More than 4x higher memory bandwidth
Significantly higher memory clock speed 800 MHz vs 396 MHz More than 2x higher memory clock speed
Wider memory bus 128 bit vs 64 bit 2x wider memory bus

Features Key features of the Radeon HD 3550  vs 2600 XT 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 3550
2.38 GPixel/s
Radeon HD 2600 XT Mac
2.8 GPixel/s

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

Radeon HD 3550
2.38 GTexel/s
Radeon HD 2600 XT Mac
5.6 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 3550
47.52 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 3550  vs
2600 XT Mac 
GPU brand ATI ATI
GPU name RV620 RV630
Market Desktop Desktop
Clock speed 594 MHz 700 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 40 120
Texture mapping units 4 8
Render output processors 4 4
Compute units 2 3
Pixel rate 2.38 GPixel/s 2.8 GPixel/s
Texture rate 2.38 GTexel/s 5.6 GTexel/s
Floating-point performance 47.52 GFLOPS 168 GFLOPS

memory

Radeon HD 3550  vs
2600 XT Mac 
Memory clock speed 396 MHz 800 MHz
Effective memory clock speed 792 MHz 1,600 MHz
Memory bus 64 bit 128 bit
Memory 512 MB 256 MB
Memory type DDR2 GDDR3
Memory bandwidth 6.34 GB/s 25.6 GB/s

noise and power

TDP 30W 45W

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