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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 wider memory bus 768 bit vs 256 bit 3x wider memory bus
Higher pixel rate 32.1 GPixel/s vs 19.75 GPixel/s Around 65% higher pixel rate
More render output processors 48 vs 32 16 more render output processors
Front view of GeForce GTX 660

Reasons to consider the
Nvidia GeForce GTX 660

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Much higher effective memory clock speed 5,600 MHz vs 1,700 MHz More than 3.2x higher effective memory clock speed
Higher clock speed 823 MHz vs 669 MHz Around 25% higher clock speed
Higher texture rate 79 GTexel/s vs 32.1 GTexel/s Around 2.5x higher texture rate
More texture mapping units 96 vs 48 Twice as many texture mapping units
Better floating-point performance 1,896.2 GFLOPS vs 1,284.6 GFLOPS Around 50% better floating-point performance
Significantly higher memory clock speed 1,400 MHz vs 850 MHz Around 65% higher memory clock speed
Slightly higher memory bandwidth 179.2 GB/s vs 163.2 GB/s Around 10% higher memory bandwidth
Slightly more shading units 1,152 vs 960 192 more shading units

Features Key features of the Radeon HD 3850 X3  vs GeForce GTX 660 

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

Radeon HD 3850 X3
163.2 GB/s
GeForce GTX 660
179.2 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
GeForce GTX 660
19.75 GPixel/s

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

Radeon HD 3850 X3
32.1 GTexel/s
GeForce GTX 660
79 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 3850 X3
1,284.6 GFLOPS
GeForce GTX 660
1,896.2 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
GeForce GTX 660 
GPU brand ATI Nvidia
GPU name RV670 GK104
Market Desktop Desktop
Clock speed 669 MHz 823 MHz
Is dual GPU No No
Reference card None Nvidia GeForce GTX 660 980 MHz 2 GB

raw performance

Shading units 960 1,152
Texture mapping units 48 96
Render output processors 48 32
Pixel rate 32.1 GPixel/s 19.75 GPixel/s
Texture rate 32.1 GTexel/s 79 GTexel/s
Floating-point performance 1,284.6 GFLOPS 1,896.2 GFLOPS

memory

Radeon HD 3850 X3  vs
GeForce GTX 660 
Memory clock speed 850 MHz 1,400 MHz
Effective memory clock speed 1,700 MHz 5,600 MHz
Memory bus 768 bit 256 bit
Memory 1,536 MB 2,048 MB
Memory type GDDR3 GDDR5
Memory bandwidth 163.2 GB/s 179.2 GB/s

noise and power

TDP 145W 130W

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