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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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Higher effective memory clock speed 3,200 MHz vs 2,400 MHz Around 35% higher effective memory clock speed
Significantly lower TDP 18W vs 106W 5.9x lower TDP
Front view of Radeon HD 3870

Reasons to consider the
Sapphire Radeon HD 3870

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Higher clock speed 825 MHz vs 625 MHz More than 30% higher clock speed
Higher memory bandwidth 76.8 GB/s vs 25.6 GB/s Around 3x higher memory bandwidth
Higher pixel rate 13.2 GPixel/s vs 2.5 GPixel/s More than 5.2x higher pixel rate
Significantly wider memory bus 256 bit vs 64 bit 4x wider memory bus
Significantly higher memory clock speed 1,200 MHz vs 800 MHz 50% higher memory clock speed
More render output processors 16 vs 4 12 more render output processors

Features Key features of the Radeon HD 6450  vs 3870 

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

Radeon HD 6450
25.6 GB/s
Radeon HD 3870
76.8 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 3870
13.2 GPixel/s

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

Radeon HD 6450
5 GTexel/s
Radeon HD 3870
13.2 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6450
200 GFLOPS
Radeon HD 3870
528 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

Reviews Word on the street

Specifications Full list of technical specs

gpu

Radeon HD 6450  vs
3870 
GPU brand AMD ATI
GPU name Caicos PRO RV670 XT
Market Desktop Desktop
Clock speed 625 MHz 825 MHz
Is dual GPU No No
Reference card None ATi Radeon HD 3870 777 MHz 512 MB

raw performance

Shading units 160 320
Texture mapping units 8 16
Render output processors 4 16
Compute units 2 4
Pixel rate 2.5 GPixel/s 13.2 GPixel/s
Texture rate 5 GTexel/s 13.2 GTexel/s
Floating-point performance 200 GFLOPS 528 GFLOPS

memory

Radeon HD 6450  vs
3870 
Memory clock speed 800 MHz 1,200 MHz
Effective memory clock speed 3,200 MHz 2,400 MHz
Memory bus 64 bit 256 bit
Memory 512 MB 512 MB
Memory type GDDR5 GDDR4
Memory bandwidth 25.6 GB/s 76.8 GB/s

noise and power

TDP 18W 106W

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