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Differences What are the advantages of each

Front view of Radeon HD 5770 X2

Reasons to consider the
Generic Radeon HD 5770 X2

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Is dual GPU Yes vs No About half of graphics cards are dual GPU
More render output processors 32 vs 24 8 more render output processors
More shading units 1,600 vs 1,344 256 more shading units
Wider memory bus 256 bit vs 192 bit Around 35% wider memory bus
Front view of GeForce GTX 660 Ti

Reasons to consider the
Generic GeForce GTX 660 Ti

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Higher effective memory clock speed 6,008 MHz vs 4,800 MHz More than 25% higher effective memory clock speed
Slightly higher clock speed 915 MHz vs 850 MHz Around 10% higher clock speed
Higher texture rate 102.5 GTexel/s vs 68 GTexel/s More than 50% higher texture rate
More texture mapping units 112 vs 80 32 more texture mapping units
Higher memory clock speed 1,502 MHz vs 1,200 MHz More than 25% higher memory clock speed

Features Key features of the Radeon HD 5770 X2  vs GeForce GTX 660 Ti 

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

Radeon HD 5770 X2
153.6 GB/s
GeForce GTX 660 Ti
144.2 GB/s

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

Radeon HD 5770 X2
27.2 GPixel/s
GeForce GTX 660 Ti
25.62 GPixel/s

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

Radeon HD 5770 X2
68 GTexel/s
GeForce GTX 660 Ti
102.5 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 5770 X2
2,720 GFLOPS
GeForce GTX 660 Ti
2,459.5 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 5770 X2  vs
GeForce GTX 660 Ti 
GPU brand ATI Nvidia
GPU name Juniper GK104
Market Desktop Desktop
Clock speed 850 MHz 915 MHz
Is dual GPU Yes No
Reference card ATi Radeon HD 5770 X2 850 MHz 2 GB Nvidia GeForce GTX 660 Ti 915 MHz 2 GB

raw performance

Shading units 1,600 1,344
Texture mapping units 80 112
Render output processors 32 24
Pixel rate 27.2 GPixel/s 25.62 GPixel/s
Texture rate 68 GTexel/s 102.5 GTexel/s
Floating-point performance 2,720 GFLOPS 2,459.5 GFLOPS

memory

Radeon HD 5770 X2  vs
GeForce GTX 660 Ti 
Memory clock speed 1,200 MHz 1,502 MHz
Effective memory clock speed 4,800 MHz 6,008 MHz
Memory bus 256 bit 192 bit
Memory 2,048 MB 2,048 MB
Memory type GDDR5 GDDR5
Memory bandwidth 153.6 GB/s 144.2 GB/s

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