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Differences What are the advantages of each

Front view of Radeon HD 8490

Reasons to consider the
AMD Radeon HD 8490

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Higher clock speed 875 MHz vs 650 MHz Around 35% higher clock speed
Higher effective memory clock speed 1,800 MHz vs 666 MHz Around 2.8x higher effective memory clock speed
Much higher memory clock speed 900 MHz vs 333 MHz Around 2.8x higher memory clock speed
Front view of Radeon HD 5450 PCI

Reasons to consider the
ATi Radeon HD 5450 PCI

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Slightly lower TDP 19W vs 35W More than 45% lower TDP

Features Key features of the Radeon HD 8490  vs 5450 PCI 

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

Radeon HD 8490
14.4 GB/s
Radeon HD 5450 PCI
5.33 GB/s

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

Radeon HD 8490
3.5 GPixel/s
Radeon HD 5450 PCI
2.6 GPixel/s

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

Radeon HD 8490
7 GTexel/s
Radeon HD 5450 PCI
5.2 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 8490
280 GFLOPS
Radeon HD 5450 PCI
104 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 8490  vs
5450 PCI 
GPU brand AMD ATI
GPU name Caicos XTX Cedar
Market Desktop Desktop
Clock speed 875 MHz 650 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 160 80
Texture mapping units 8 8
Render output processors 4 4
Compute units 2 2
Pixel rate 3.5 GPixel/s 2.6 GPixel/s
Texture rate 7 GTexel/s 5.2 GTexel/s
Floating-point performance 280 GFLOPS 104 GFLOPS

memory

Radeon HD 8490  vs
5450 PCI 
Memory clock speed 900 MHz 333 MHz
Effective memory clock speed 1,800 MHz 666 MHz
Memory bus 64 bit 64 bit
Memory 1,024 MB 512 MB
Memory type DDR3 DDR2
Memory bandwidth 14.4 GB/s 5.33 GB/s

noise and power

TDP 35W 19W

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