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Differences What are the advantages of each

Front view of Radeon HD 4850

Reasons to consider the
ATi Radeon HD 4850

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Slightly better floating-point performance 1,000 GFLOPS vs 528 GFLOPS Around 90% better floating-point performance
More shading units 800 vs 320 480 more shading units
More texture mapping units 40 vs 16 24 more texture mapping units
More compute units 10 vs 4 6 more compute units
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 effective memory clock speed 2,400 MHz vs 1,986 MHz More than 20% higher effective memory clock speed
Higher memory clock speed 1,200 MHz vs 993 MHz More than 20% higher memory clock speed

Features Key features of the Radeon HD 4850  vs 3870 

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

Radeon HD 4850
63.55 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 4850
10 GPixel/s
Radeon HD 3870
13.2 GPixel/s

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

Radeon HD 4850
25 GTexel/s
Radeon HD 3870
13.2 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 4850
1,000 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 4850  vs
3870 
GPU brand ATI ATI
GPU name RV770 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 800 320
Texture mapping units 40 16
Render output processors 16 16
Compute units 10 4
Pixel rate 10 GPixel/s 13.2 GPixel/s
Texture rate 25 GTexel/s 13.2 GTexel/s
Floating-point performance 1,000 GFLOPS 528 GFLOPS

memory

Radeon HD 4850  vs
3870 
Memory clock speed 993 MHz 1,200 MHz
Effective memory clock speed 1,986 MHz 2,400 MHz
Memory bus 256 bit 256 bit
Memory 512 MB 512 MB
Memory type GDDR3 GDDR4
Memory bandwidth 63.55 GB/s 76.8 GB/s

noise and power

TDP 110W 106W

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