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Differences What are the advantages of each

Front view of Radeon HD 4720

Reasons to consider the
ATi Radeon HD 4720

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Slightly lower TDP 55W vs 65W More than 15% lower TDP
Front view of GeForce GT 640

Reasons to consider the
Leadtek GeForce GT 640

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Higher clock speed 902 MHz vs 600 MHz More than 50% higher clock speed
Higher effective memory clock speed 1,800 MHz vs 1,334 MHz Around 35% higher effective memory clock speed
More render output processors 16 vs 8 Twice as many render output processors
Higher memory clock speed 900 MHz vs 667 MHz Around 35% higher memory clock speed

Features Key features of the Radeon HD 4720  vs GeForce GT 640 

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

Radeon HD 4720
21.34 GB/s
GeForce GT 640
28.8 GB/s

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

Radeon HD 4720
4.8 GPixel/s
GeForce GT 640
7.22 GPixel/s

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

Radeon HD 4720
19.2 GTexel/s
GeForce GT 640
28.86 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 4720
384 GFLOPS
GeForce GT 640
692.7 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 4720  vs
GeForce GT 640 
GPU brand ATI Nvidia
GPU name RV730 GK107
Market Desktop Desktop
Clock speed 600 MHz 902 MHz
Is dual GPU No No
Reference card None Nvidia GeForce GT 640 902 MHz 2 GB

raw performance

Shading units 320 384
Texture mapping units 32 32
Render output processors 8 16
Pixel rate 4.8 GPixel/s 7.22 GPixel/s
Texture rate 19.2 GTexel/s 28.86 GTexel/s
Floating-point performance 384 GFLOPS 692.7 GFLOPS

memory

Radeon HD 4720  vs
GeForce GT 640 
Memory clock speed 667 MHz 900 MHz
Effective memory clock speed 1,334 MHz 1,800 MHz
Memory bus 128 bit 128 bit
Memory 1,024 MB 1,024 MB
Memory type GDDR3 DDR3
Memory bandwidth 21.34 GB/s 28.8 GB/s

noise and power

TDP 55W 65W

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