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Differences What are the advantages of each

Front view of Radeon HD 5770

Reasons to consider the
ATi Radeon HD 5770

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Much higher effective memory clock speed 4,800 MHz vs 666 MHz Around 7.2x higher effective memory clock speed
Significantly higher memory bandwidth 76.8 GB/s vs 5.33 GB/s Around 14.5x higher memory bandwidth
Higher clock speed 850 MHz vs 650 MHz More than 30% higher clock speed
Better floating-point performance 1,360 GFLOPS vs 104 GFLOPS More than 13x better floating-point performance
Much higher memory clock speed 1,200 MHz vs 333 MHz More than 3.5x higher memory clock speed
Higher texture rate 34 GTexel/s vs 5.2 GTexel/s More than 6.5x higher texture rate
More shading units 800 vs 80 720 more shading units
Higher pixel rate 13.6 GPixel/s vs 2.6 GPixel/s Around 5.2x higher pixel rate
More texture mapping units 40 vs 8 32 more texture mapping units
More render output processors 16 vs 4 12 more render output processors
More compute units 10 vs 2 8 more compute units
Wider memory bus 128 bit vs 64 bit 2x wider memory bus
Front view of Radeon HD 5450 PCI

Reasons to consider the
ATi Radeon HD 5450 PCI

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Significantly lower TDP 19W vs 108W 5.7x lower TDP

Features Key features of the Radeon HD 5770  vs 5450 PCI 

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

Radeon HD 5770
76.8 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 5770
13.6 GPixel/s
Radeon HD 5450 PCI
2.6 GPixel/s

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

Radeon HD 5770
34 GTexel/s
Radeon HD 5450 PCI
5.2 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 5770
1,360 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 5770  vs
5450 PCI 
GPU brand ATI ATI
GPU name Juniper Cedar
Market Desktop Desktop
Clock speed 850 MHz 650 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 800 80
Texture mapping units 40 8
Render output processors 16 4
Compute units 10 2
Pixel rate 13.6 GPixel/s 2.6 GPixel/s
Texture rate 34 GTexel/s 5.2 GTexel/s
Floating-point performance 1,360 GFLOPS 104 GFLOPS

memory

Radeon HD 5770  vs
5450 PCI 
Memory clock speed 1,200 MHz 333 MHz
Effective memory clock speed 4,800 MHz 666 MHz
Memory bus 128 bit 64 bit
Memory 1,024 MB 512 MB
Memory type GDDR5 DDR2
Memory bandwidth 76.8 GB/s 5.33 GB/s

noise and power

TDP 108W 19W

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