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Differences What are the advantages of each

Front view of GeForce GT 640

Reasons to consider the
Leadtek GeForce GT 640

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Significantly higher clock speed 902 MHz vs 550 MHz Around 65% higher clock speed
Better floating-point performance 692.7 GFLOPS vs 89.6 GFLOPS Around 7.8x better floating-point performance
Higher texture rate 28.86 GTexel/s vs 8.8 GTexel/s More than 3.2x higher texture rate
More shading units 384 vs 32 352 more shading units
More render output processors 16 vs 8 Twice as many render output processors
More texture mapping units 32 vs 16 Twice as many texture mapping units
Higher memory clock speed 900 MHz vs 800 MHz Around 15% higher memory clock speed
Front view of GeForce GT 120 Mac

Reasons to consider the
Nvidia GeForce GT 120 Mac

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Slightly lower TDP 50W vs 65W Around 25% lower TDP

Features Key features of the GeForce GT 640  vs 120 Mac 

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

GeForce GT 640
28.8 GB/s
GeForce GT 120 Mac
25.6 GB/s

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

GeForce GT 640
7.22 GPixel/s
GeForce GT 120 Mac
4.4 GPixel/s

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

GeForce GT 640
28.86 GTexel/s
GeForce GT 120 Mac
8.8 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GT 640
692.7 GFLOPS
GeForce GT 120 Mac
89.6 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

GeForce GT 640  vs
120 Mac 
GPU brand Nvidia Nvidia
GPU name GK107 G96 C1
Market Desktop Desktop
Clock speed 902 MHz 550 MHz
Is dual GPU No No
Reference card Nvidia GeForce GT 640 902 MHz 2 GB None

raw performance

Shading units 384 32
Texture mapping units 32 16
Render output processors 16 8
Pixel rate 7.22 GPixel/s 4.4 GPixel/s
Texture rate 28.86 GTexel/s 8.8 GTexel/s
Floating-point performance 692.7 GFLOPS 89.6 GFLOPS

memory

GeForce GT 640  vs
120 Mac 
Memory clock speed 900 MHz 800 MHz
Effective memory clock speed 1,800 MHz 1,600 MHz
Memory bus 128 bit 128 bit
Memory 1,024 MB 512 MB
Memory type DDR3 GDDR3
Memory bandwidth 28.8 GB/s 25.6 GB/s

noise and power

TDP 65W 50W

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