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Differences What are the advantages of each

Front view of Radeon HD 3850 X3

Reasons to consider the
ATi Radeon HD 3850 X3

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Much higher memory bandwidth 163.2 GB/s vs 26.56 GB/s Around 6.2x higher memory bandwidth
Much wider memory bus 768 bit vs 128 bit 6x wider memory bus
More memory 1,536 MB vs 256 MB 6x more memory
Significantly more render output processors 48 vs 16 Three times as many render output processors
Higher pixel rate 32.1 GPixel/s vs 10.72 GPixel/s Around 3x higher pixel rate
Better floating-point performance 1,284.6 GFLOPS vs 428.8 GFLOPS Around 3x better floating-point performance
More shading units 960 vs 320 Three times as many shading units
Higher texture rate 32.1 GTexel/s vs 10.72 GTexel/s Around 3x higher texture rate
More texture mapping units 48 vs 16 Three times as many texture mapping units
More compute units 12 vs 4 Three times as many compute units
Front view of Radeon HD 3690

Reasons to consider the
ATi Radeon HD 3690

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Lower TDP 75W vs 145W Around 50% lower TDP

Features Key features of the Radeon HD 3850 X3  vs 3690 

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

Radeon HD 3850 X3
163.2 GB/s
Radeon HD 3690
26.56 GB/s

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

Radeon HD 3850 X3
32.1 GPixel/s
Radeon HD 3690
10.72 GPixel/s

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

Radeon HD 3850 X3
32.1 GTexel/s
Radeon HD 3690
10.72 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 3850 X3
1,284.6 GFLOPS
Radeon HD 3690
428.8 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 3850 X3  vs
3690 
GPU brand ATI ATI
GPU name RV670 RV670
Market Desktop Desktop
Clock speed 669 MHz 670 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 960 320
Texture mapping units 48 16
Render output processors 48 16
Compute units 12 4
Pixel rate 32.1 GPixel/s 10.72 GPixel/s
Texture rate 32.1 GTexel/s 10.72 GTexel/s
Floating-point performance 1,284.6 GFLOPS 428.8 GFLOPS

memory

Radeon HD 3850 X3  vs
3690 
Memory clock speed 850 MHz 830 MHz
Effective memory clock speed 1,700 MHz 1,660 MHz
Memory bus 768 bit 128 bit
Memory 1,536 MB 256 MB
Memory type GDDR3 GDDR3
Memory bandwidth 163.2 GB/s 26.56 GB/s

noise and power

TDP 145W 75W

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