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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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Higher effective memory clock speed 1,986 MHz vs 800 MHz Around 2.5x higher effective memory clock speed
Higher memory bandwidth 63.55 GB/s vs 25.6 GB/s Around 2.5x higher memory bandwidth
Much higher memory clock speed 993 MHz vs 400 MHz Around 2.5x higher memory clock speed
Better floating-point performance 1,000 GFLOPS vs 428.16 GFLOPS More than 2.2x 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
Slightly higher texture rate 25 GTexel/s vs 10.7 GTexel/s More than 2.2x higher texture rate
More compute units 10 vs 4 6 more compute units
Front view of Radeon HD 3850

Reasons to consider the
ASUS Radeon HD 3850

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Lower TDP 75W vs 110W More than 30% lower TDP

Features Key features of the Radeon HD 4850  vs 3850 

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

Radeon HD 4850
63.55 GB/s
Radeon HD 3850
25.6 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 3850
10.7 GPixel/s

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

Radeon HD 4850
25 GTexel/s
Radeon HD 3850
10.7 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 4850
1,000 GFLOPS
Radeon HD 3850
428.16 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
3850 
GPU brand ATI ATI
GPU name RV770 RV670 PRO
Market Desktop Desktop
Clock speed 625 MHz 669 MHz
Is dual GPU No No
Reference card None ATi Radeon HD 3850 668 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 10.7 GPixel/s
Texture rate 25 GTexel/s 10.7 GTexel/s
Floating-point performance 1,000 GFLOPS 428.16 GFLOPS

memory

Radeon HD 4850  vs
3850 
Memory clock speed 993 MHz 400 MHz
Effective memory clock speed 1,986 MHz 800 MHz
Memory bus 256 bit 256 bit
Memory 512 MB 512 MB
Memory type GDDR3 DDR2
Memory bandwidth 63.55 GB/s 25.6 GB/s

noise and power

TDP 110W 75W

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