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Differences What are the advantages of each

Front view of Radeon HD 6390

Reasons to consider the
AMD Radeon HD 6390

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More shading units 320 vs 96 224 more shading units
Lower TDP 39W vs 65W 40% lower TDP
Front view of GeForce GT 440

Reasons to consider the
Nvidia GeForce GT 440

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Higher clock speed 810 MHz vs 550 MHz More than 45% higher clock speed
Higher effective memory clock speed 1,800 MHz vs 1,000 MHz 80% higher effective memory clock speed
Significantly higher memory clock speed 900 MHz vs 500 MHz 80% higher memory clock speed

Features Key features of the Radeon HD 6390  vs GeForce GT 440 

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

Radeon HD 6390
16 GB/s
GeForce GT 440
28.8 GB/s

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

Radeon HD 6390
4.4 GPixel/s
GeForce GT 440
3.24 GPixel/s

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

Radeon HD 6390
8.8 GTexel/s
GeForce GT 440
12.96 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 6390
352 GFLOPS
GeForce GT 440
311.04 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 6390  vs
GeForce GT 440 
GPU brand AMD Nvidia
GPU name Redwood LE GF108
Market Desktop Desktop
Clock speed 550 MHz 810 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 320 96
Texture mapping units 16 16
Render output processors 8 4
Pixel rate 4.4 GPixel/s 3.24 GPixel/s
Texture rate 8.8 GTexel/s 12.96 GTexel/s
Floating-point performance 352 GFLOPS 311.04 GFLOPS

memory

Radeon HD 6390  vs
GeForce GT 440 
Memory clock speed 500 MHz 900 MHz
Effective memory clock speed 1,000 MHz 1,800 MHz
Memory bus 128 bit 128 bit
Memory 1,024 MB 1,024 MB
Memory type DDR2 DDR3
Memory bandwidth 16 GB/s 28.8 GB/s

noise and power

TDP 39W 65W

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