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Differences What are the advantages of each

Front view of Radeon HD 5450

Reasons to consider the
ATi Radeon HD 5450

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Significantly lower TDP 19W vs 106W 5.6x lower TDP
Front view of Radeon HD 3870 Mac

Reasons to consider the
ATi Radeon HD 3870 Mac

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Significantly higher memory bandwidth 72.06 GB/s vs 6.4 GB/s More than 11.2x higher memory bandwidth
Higher effective memory clock speed 2,252 MHz vs 800 MHz More than 2.8x higher effective memory clock speed
Higher clock speed 777 MHz vs 650 MHz Around 20% higher clock speed
Much higher memory clock speed 1,126 MHz vs 400 MHz More than 2.8x higher memory clock speed
Significantly wider memory bus 256 bit vs 64 bit 4x wider memory bus
Higher pixel rate 12.43 GPixel/s vs 2.6 GPixel/s More than 4.8x higher pixel rate
More render output processors 16 vs 4 12 more render output processors
More shading units 320 vs 80 240 more shading units

Features Key features of the Radeon HD 5450  vs 3870 Mac 

memory bandwidth Rate at which data can be read from or stored in onboard memory

Radeon HD 5450
6.4 GB/s
Radeon HD 3870 Mac
72.06 GB/s

pixel rate Number of pixels a graphics card can render to the screen every second

Radeon HD 5450
2.6 GPixel/s
Radeon HD 3870 Mac
12.43 GPixel/s

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

Radeon HD 5450
5.2 GTexel/s
Radeon HD 3870 Mac
12.43 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 5450
104 GFLOPS
Radeon HD 3870 Mac
497.3 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 5450  vs
3870 Mac 
GPU brand ATI ATI
GPU name Cedar RV670
Market Desktop Desktop
Clock speed 650 MHz 777 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 80 320
Texture mapping units 8 16
Render output processors 4 16
Compute units 2 4
Pixel rate 2.6 GPixel/s 12.43 GPixel/s
Texture rate 5.2 GTexel/s 12.43 GTexel/s
Floating-point performance 104 GFLOPS 497.3 GFLOPS

memory

Radeon HD 5450  vs
3870 Mac 
Memory clock speed 400 MHz 1,126 MHz
Effective memory clock speed 800 MHz 2,252 MHz
Memory bus 64 bit 256 bit
Memory 512 MB 512 MB
Memory type DDR2 GDDR4
Memory bandwidth 6.4 GB/s 72.06 GB/s

noise and power

TDP 19W 106W

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