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Differences What are the advantages of each

Front view of GeForce GTS 450

Reasons to consider the
Nvidia GeForce GTS 450

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More render output processors 16 vs 8 Twice as many render output processors
Front view of GeForce 840A

Reasons to consider the
Nvidia GeForce 840A

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Higher clock speed 1,029 MHz vs 783 MHz More than 30% higher clock speed
Slightly higher effective memory clock speed 2,002 MHz vs 1,400 MHz Around 45% higher effective memory clock speed
Higher memory clock speed 1,001 MHz vs 700 MHz Around 45% higher memory clock speed
Lower TDP 33W vs 106W 3.2x lower TDP

Features Key features of the GeForce GTS 450  vs 840A 

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

GeForce GTS 450
22.4 GB/s
GeForce 840A
16.02 GB/s

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

GeForce GTS 450
4.7 GPixel/s
GeForce 840A
8.23 GPixel/s

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

GeForce GTS 450
18.79 GTexel/s
GeForce 840A
16.46 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GTS 450
451 GFLOPS
GeForce 840A
790.3 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

GeForce GTS 450  vs
840A 
GPU brand Nvidia Nvidia
GPU name GF116 GM108
Market Desktop Laptop
Clock speed 783 MHz 1,029 MHz
Is dual GPU No No
Reference card None None

raw performance

Shading units 144 384
Texture mapping units 24 16
Render output processors 16 8
Pixel rate 4.7 GPixel/s 8.23 GPixel/s
Texture rate 18.79 GTexel/s 16.46 GTexel/s
Floating-point performance 451 GFLOPS 790.3 GFLOPS

memory

GeForce GTS 450  vs
840A 
Memory clock speed 700 MHz 1,001 MHz
Effective memory clock speed 1,400 MHz 2,002 MHz
Memory bus 128 bit 64 bit
Memory 1,024 MB 1,024 MB
Memory type DDR3 DDR3
Memory bandwidth 22.4 GB/s 16.02 GB/s

noise and power

TDP 106W 33W

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