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Differences What are the advantages of each

Front view of Radeon HD 5450 PCI

Reasons to consider the
ATi Radeon HD 5450 PCI

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Lower TDP 19W vs 45W 2.4x 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 effective memory clock speed 1,600 MHz vs 666 MHz Around 2.5x higher effective memory clock speed
Higher memory bandwidth 25.6 GB/s vs 5.33 GB/s More than 4.8x higher memory bandwidth
Significantly higher memory clock speed 800 MHz vs 333 MHz Around 2.5x higher memory clock speed
Wider memory bus 128 bit vs 64 bit 2x wider memory bus

Features Key features of the Radeon HD 5450 PCI  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 5450 PCI
2.6 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 5450 PCI
5.2 GTexel/s
Radeon HD 2600 XT Mac
5.6 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 5450 PCI  vs
2600 XT Mac 
GPU brand ATI ATI
GPU name Cedar RV630
Market Desktop Desktop
Clock speed 650 MHz 700 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 80 120
Texture mapping units 8 8
Render output processors 4 4
Compute units 2 3
Pixel rate 2.6 GPixel/s 2.8 GPixel/s
Texture rate 5.2 GTexel/s 5.6 GTexel/s
Floating-point performance 104 GFLOPS 168 GFLOPS

memory

Radeon HD 5450 PCI  vs
2600 XT Mac 
Memory clock speed 333 MHz 800 MHz
Effective memory clock speed 666 MHz 1,600 MHz
Memory bus 64 bit 128 bit
Memory 512 MB 256 MB
Memory type DDR2 GDDR3
Memory bandwidth 5.33 GB/s 25.6 GB/s

noise and power

TDP 19W 45W

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