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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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Lower TDP 19W vs 65W 3.4x lower TDP
Front view of Radeon HD 4580

Reasons to consider the
ATi Radeon HD 4580

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Higher clock speed 796 MHz vs 650 MHz More than 20% higher clock speed
Higher effective memory clock speed 1,386 MHz vs 800 MHz Around 75% higher effective memory clock speed
Slightly higher memory bandwidth 22.18 GB/s vs 6.4 GB/s Around 3.5x higher memory bandwidth
Higher memory clock speed 693 MHz vs 400 MHz Around 75% higher memory clock speed
Wider memory bus 128 bit vs 64 bit 2x wider memory bus

Features Key features of the Radeon HD 5450  vs 4580 

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

Radeon HD 5450
6.4 GB/s
Radeon HD 4580
22.18 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 4580
3.18 GPixel/s

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

Radeon HD 5450
5.2 GTexel/s
Radeon HD 4580
6.37 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 5450
104 GFLOPS
Radeon HD 4580
191.04 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
4580 
GPU brand ATI ATI
GPU name Cedar RV635
Market Desktop Desktop
Clock speed 650 MHz 796 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 3.18 GPixel/s
Texture rate 5.2 GTexel/s 6.37 GTexel/s
Floating-point performance 104 GFLOPS 191.04 GFLOPS

memory

Radeon HD 5450  vs
4580 
Memory clock speed 400 MHz 693 MHz
Effective memory clock speed 800 MHz 1,386 MHz
Memory bus 64 bit 128 bit
Memory 512 MB 512 MB
Memory type DDR2 GDDR3
Memory bandwidth 6.4 GB/s 22.18 GB/s

noise and power

TDP 19W 65W

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