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Differences What are the advantages of each

Front view of Radeon HD 6450

Reasons to consider the
AMD Radeon HD 6450

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Significantly higher effective memory clock speed 3,200 MHz vs 1,386 MHz More than 2.2x higher effective memory clock speed
Higher memory clock speed 800 MHz vs 693 MHz More than 15% higher memory clock speed
Lower TDP 18W vs 65W 3.6x 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 625 MHz More than 25% higher clock speed
Wider memory bus 128 bit vs 64 bit 2x wider memory bus

Features Key features of the Radeon HD 6450  vs 4580 

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

Radeon HD 6450
25.6 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 6450
2.5 GPixel/s
Radeon HD 4580
3.18 GPixel/s

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

Radeon HD 6450
5 GTexel/s
Radeon HD 4580
6.37 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6450
200 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 6450  vs
4580 
GPU brand AMD ATI
GPU name Caicos PRO RV635
Market Desktop Desktop
Clock speed 625 MHz 796 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 160 120
Texture mapping units 8 8
Render output processors 4 4
Compute units 2 3
Pixel rate 2.5 GPixel/s 3.18 GPixel/s
Texture rate 5 GTexel/s 6.37 GTexel/s
Floating-point performance 200 GFLOPS 191.04 GFLOPS

memory

Radeon HD 6450  vs
4580 
Memory clock speed 800 MHz 693 MHz
Effective memory clock speed 3,200 MHz 1,386 MHz
Memory bus 64 bit 128 bit
Memory 512 MB 512 MB
Memory type GDDR5 GDDR3
Memory bandwidth 25.6 GB/s 22.18 GB/s

noise and power

TDP 18W 65W

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