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Differences What are the advantages of each

Front view of Radeon HD 6490M Mac

Reasons to consider the
AMD Radeon HD 6490M Mac

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Higher clock speed 750 MHz vs 518 MHz Around 45% higher clock speed
Higher effective memory clock speed 3,176 MHz vs 2,016 MHz Around 60% higher effective memory clock speed
Front view of GeForce GTX 260

Reasons to consider the
Nvidia GeForce GTX 260

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Higher memory bandwidth 112.9 GB/s vs 25.41 GB/s Around 4.5x higher memory bandwidth
More memory 1,792 MB vs 256 MB 7x more memory
More render output processors 28 vs 4 24 more render output processors
More texture mapping units 64 vs 8 56 more texture mapping units
Higher pixel rate 14.5 GPixel/s vs 3 GPixel/s More than 4.8x higher pixel rate
Slightly higher texture rate 33.15 GTexel/s vs 6 GTexel/s More than 5.5x higher texture rate
Wider memory bus 448 bit vs 64 bit 7x wider memory bus
Higher memory clock speed 1,008 MHz vs 794 MHz More than 25% higher memory clock speed

Features Key features of the Radeon HD 6490M Mac  vs GeForce GTX 260 

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

Radeon HD 6490M Mac
25.41 GB/s
GeForce GTX 260
112.9 GB/s

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

Radeon HD 6490M Mac
3 GPixel/s
GeForce GTX 260
14.5 GPixel/s

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

Radeon HD 6490M Mac
6 GTexel/s
GeForce GTX 260
33.15 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6490M Mac
240 GFLOPS
GeForce GTX 260
414.7 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 6490M Mac  vs
GeForce GTX 260 
GPU brand AMD Nvidia
GPU name Seymour GT200B
Market Laptop Desktop
Clock speed 750 MHz 518 MHz
Is dual GPU No No
Reference card None Nvidia GeForce GTX 260 576 MHz 896 MB

raw performance

Shading units 160 192
Texture mapping units 8 64
Render output processors 4 28
Pixel rate 3 GPixel/s 14.5 GPixel/s
Texture rate 6 GTexel/s 33.15 GTexel/s
Floating-point performance 240 GFLOPS 414.7 GFLOPS

memory

Radeon HD 6490M Mac  vs
GeForce GTX 260 
Memory clock speed 794 MHz 1,008 MHz
Effective memory clock speed 3,176 MHz 2,016 MHz
Memory bus 64 bit 448 bit
Memory 256 MB 1,792 MB
Memory type GDDR5 GDDR3
Memory bandwidth 25.41 GB/s 112.9 GB/s

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