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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 589 MHz Around 55% higher clock speed
Better PassMark score 1,282 vs 126 Around 10.2x better PassMark score
Higher effective memory clock speed 1,800 MHz vs 800 MHz 2.2x higher effective memory clock speed
Higher memory bandwidth 28.8 GB/s vs 6.4 GB/s Around 4.5x higher memory bandwidth
Better floating-point performance 692.7 GFLOPS vs 22.43 GFLOPS Around 31x better floating-point performance
Higher texture rate 28.86 GTexel/s vs 2.36 GTexel/s Around 12.2x higher texture rate
Significantly higher memory clock speed 900 MHz vs 400 MHz 2.2x higher memory clock speed
More render output processors 16 vs 4 12 more render output processors
More texture mapping units 32 vs 4 28 more texture mapping units
More shading units 384 vs 8 376 more shading units
Wider memory bus 128 bit vs 64 bit 2x wider memory bus
Front view of GeForce 205

Reasons to consider the
Nvidia GeForce 205

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Lower TDP 31W vs 65W 2.1x lower TDP

Benchmarks Real world tests of GeForce GT 640 vs 205

PassMark Industry standard benchmark for overall graphics card performanceData courtesy Passmark

Features Key features of the GeForce GT 640  vs 205 

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

GeForce GT 640
28.8 GB/s
GeForce 205
6.4 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 205
2.36 GPixel/s

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

GeForce GT 640
28.86 GTexel/s
GeForce 205
2.36 GTexel/s

floating point performance How fast the gpu can crunch numbers

GeForce GT 640
692.7 GFLOPS
GeForce 205
22.43 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

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