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Differences What are the advantages of each

Front view of Radeon HD 5770

Reasons to consider the
ATi Radeon HD 5770

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Significantly higher effective memory clock speed 4,800 MHz vs 2,484 MHz Around 95% higher effective memory clock speed
Higher clock speed 850 MHz vs 648 MHz More than 30% higher clock speed
Better floating-point performance 1,360 GFLOPS vs 708.5 GFLOPS More than 90% better floating-point performance
More shading units 800 vs 240 560 more shading units
Significantly lower TDP 108W vs 204W More than 45% lower TDP
Front view of GeForce GTX 285 Mac

Reasons to consider the
Nvidia GeForce GTX 285 Mac

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Significantly higher memory bandwidth 159 GB/s vs 76.8 GB/s More than 2x higher memory bandwidth
Much wider memory bus 512 bit vs 128 bit 4x wider memory bus
More render output processors 32 vs 16 Twice as many render output processors
More texture mapping units 80 vs 40 Twice as many texture mapping units
Higher texture rate 51.84 GTexel/s vs 34 GTexel/s More than 50% higher texture rate
Slightly higher pixel rate 20.74 GPixel/s vs 13.6 GPixel/s More than 50% higher pixel rate

Features Key features of the Radeon HD 5770  vs GeForce GTX 285 Mac 

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

Radeon HD 5770
76.8 GB/s

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

Radeon HD 5770
13.6 GPixel/s
GeForce GTX 285 Mac
20.74 GPixel/s

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

Radeon HD 5770
34 GTexel/s
GeForce GTX 285 Mac
51.84 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 5770
1,360 GFLOPS
GeForce GTX 285 Mac
708.5 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  vs
GeForce GTX 285 Mac 
GPU brand ATI Nvidia
GPU name Juniper GT200 B3
Market Desktop Desktop
Clock speed 850 MHz 648 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 800 240
Texture mapping units 40 80
Render output processors 16 32
Pixel rate 13.6 GPixel/s 20.74 GPixel/s
Texture rate 34 GTexel/s 51.84 GTexel/s
Floating-point performance 1,360 GFLOPS 708.5 GFLOPS

memory

Radeon HD 5770  vs
GeForce GTX 285 Mac 
Memory clock speed 1,200 MHz 1,242 MHz
Effective memory clock speed 4,800 MHz 2,484 MHz
Memory bus 128 bit 512 bit
Memory 1,024 MB 1,024 MB
Memory type GDDR5 GDDR3
Memory bandwidth 76.8 GB/s 159 GB/s

noise and power

TDP 108W 204W

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