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Differences What are the advantages of each

Front view of Radeon HD 4870 Mac

Reasons to consider the
ATi Radeon HD 4870 Mac

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Higher effective memory clock speed 3,400 MHz vs 2,484 MHz More than 35% higher effective memory clock speed
Higher clock speed 750 MHz vs 648 MHz More than 15% higher clock speed
Slightly better floating-point performance 1,200 GFLOPS vs 708.5 GFLOPS Around 70% better floating-point performance
More shading units 800 vs 240 560 more shading units
Lower TDP 150W vs 204W More than 25% lower TDP
Front view of GeForce GTX 285 Mac

Reasons to consider the
Nvidia GeForce GTX 285 Mac

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Higher memory bandwidth 159 GB/s vs 108.8 GB/s More than 45% higher memory bandwidth
Much wider memory bus 512 bit vs 256 bit 2x 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 30 GTexel/s Around 75% higher texture rate
Significantly higher memory clock speed 1,242 MHz vs 850 MHz More than 45% higher memory clock speed
Higher pixel rate 20.74 GPixel/s vs 12 GPixel/s Around 75% higher pixel rate

Features Key features of the Radeon HD 4870 Mac  vs GeForce GTX 285 Mac 

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

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

Radeon HD 4870 Mac
12 GPixel/s
GeForce GTX 285 Mac
20.74 GPixel/s

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

Radeon HD 4870 Mac
30 GTexel/s
GeForce GTX 285 Mac
51.84 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 4870 Mac
1,200 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 4870 Mac  vs
GeForce GTX 285 Mac 
GPU brand ATI Nvidia
GPU name RV770 GT200 B3
Market Desktop Desktop
Clock speed 750 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 12 GPixel/s 20.74 GPixel/s
Texture rate 30 GTexel/s 51.84 GTexel/s
Floating-point performance 1,200 GFLOPS 708.5 GFLOPS

memory

Radeon HD 4870 Mac  vs
GeForce GTX 285 Mac 
Memory clock speed 850 MHz 1,242 MHz
Effective memory clock speed 3,400 MHz 2,484 MHz
Memory bus 256 bit 512 bit
Memory 512 MB 1,024 MB
Memory type GDDR5 GDDR3
Memory bandwidth 108.8 GB/s 159 GB/s

noise and power

TDP 150W 204W

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