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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 500 MHz 50% higher clock speed
Higher effective memory clock speed 3,176 MHz vs 1,580 MHz More than 2x higher effective memory clock speed
Front view of GeForce GT 330M Mac

Reasons to consider the
Nvidia GeForce GT 330M Mac

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Wider memory bus 128 bit vs 64 bit 2x wider memory bus

Features Key features of the Radeon HD 6490M Mac  vs GeForce GT 330M 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

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

floating point performance How fast the gpu can crunch numbers

Radeon HD 6490M Mac
240 GFLOPS
GeForce GT 330M Mac
105.6 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 GT 330M Mac 
GPU brand AMD Nvidia
GPU name Seymour GT216
Market Laptop Laptop
Clock speed 750 MHz 500 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 160 48
Texture mapping units 8 16
Render output processors 4 8
Pixel rate 3 GPixel/s 4 GPixel/s
Texture rate 6 GTexel/s 8 GTexel/s
Floating-point performance 240 GFLOPS 105.6 GFLOPS

memory

Radeon HD 6490M Mac  vs
GeForce GT 330M Mac 
Memory clock speed 794 MHz 790 MHz
Effective memory clock speed 3,176 MHz 1,580 MHz
Memory bus 64 bit 128 bit
Memory 256 MB 512 MB
Memory type GDDR5 GDDR3
Memory bandwidth 25.41 GB/s 25.28 GB/s

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