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Differences What are the advantages of each

Front view of Radeon HD 4580

Reasons to consider the
ATi Radeon HD 4580

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GPUBoss is not aware of any important advantages of the ATi Radeon HD 4580 vs the Leadtek GeForce GT 640.

Front view of GeForce GT 640

Reasons to consider the
Leadtek GeForce GT 640

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Higher clock speed 902 MHz vs 796 MHz Around 15% higher clock speed
Higher effective memory clock speed 1,800 MHz vs 1,386 MHz Around 30% higher effective memory clock speed
Slightly better floating-point performance 692.7 GFLOPS vs 191.04 GFLOPS Around 3.8x better floating-point performance
Higher texture rate 28.86 GTexel/s vs 6.37 GTexel/s More than 4.5x higher texture rate
More render output processors 16 vs 4 12 more render output processors
More texture mapping units 32 vs 8 24 more texture mapping units
Higher memory clock speed 900 MHz vs 693 MHz Around 30% higher memory clock speed
More shading units 384 vs 120 264 more shading units

Features Key features of the Radeon HD 4580  vs GeForce GT 640 

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

Radeon HD 4580
22.18 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 4580
3.18 GPixel/s
GeForce GT 640
7.22 GPixel/s

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

Radeon HD 4580
6.37 GTexel/s
GeForce GT 640
28.86 GTexel/s

floating point performance How fast the gpu can crunch numbers

Radeon HD 4580
191.04 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 4580  vs
GeForce GT 640 
GPU brand ATI Nvidia
GPU name RV635 GK107
Market Desktop Desktop
Clock speed 796 MHz 902 MHz
Is dual GPU No No
Reference card None Nvidia GeForce GT 640 902 MHz 2 GB

raw performance

Shading units 120 384
Texture mapping units 8 32
Render output processors 4 16
Pixel rate 3.18 GPixel/s 7.22 GPixel/s
Texture rate 6.37 GTexel/s 28.86 GTexel/s
Floating-point performance 191.04 GFLOPS 692.7 GFLOPS

memory

Radeon HD 4580  vs
GeForce GT 640 
Memory clock speed 693 MHz 900 MHz
Effective memory clock speed 1,386 MHz 1,800 MHz
Memory bus 128 bit 128 bit
Memory 512 MB 1,024 MB
Memory type GDDR3 DDR3
Memory bandwidth 22.18 GB/s 28.8 GB/s

noise and power

TDP 65W 65W

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