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GeForce GT 640 DDR3 vs GeForce GTX 580 3GB


Intro

The GeForce GT 640 DDR3 has a GPU core clock speed of 900 MHz, and the 2048 MB of DDR3 memory runs at 1782 MHz through a 128-bit bus. It also features 384 Stream Processors, 32 TAUs, and 16 Raster Operation Units.

Compare those specs to the GeForce GTX 580 3GB, which comes with a GPU core clock speed of 772 MHz, and 3072 MB of GDDR5 RAM set to run at 1002 MHz through a 384-bit bus. It also is comprised of 512 Stream Processors, 64 Texture Address Units, and 48 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
GeForce GTX 580 3GB 244 Watts
Difference: 179 Watts (275%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 580 3GB is 237% quicker than the GeForce GT 640 DDR3 in general, because of its higher bandwidth. (explain)

GeForce GTX 580 3GB 192384 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 135360 (237%)

Texel Rate

The GeForce GTX 580 3GB will be quite a bit (about 72%) more effective at texture filtering than the GeForce GT 640 DDR3. (explain)

GeForce GTX 580 3GB 49408 Mtexels/sec
GeForce GT 640 DDR3 28800 Mtexels/sec
Difference: 20608 (72%)

Pixel Rate

The GeForce GTX 580 3GB should be much (more or less 157%) faster with regards to AA than the GeForce GT 640 DDR3, and also able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 580 3GB 37056 Mpixels/sec
GeForce GT 640 DDR3 14400 Mpixels/sec
Difference: 22656 (157%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

GeForce GT 640 DDR3

GeForce GTX 580 3GB

Specifications

Display Specifications

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Model GeForce GT 640 DDR3 GeForce GTX 580 3GB
Manufacturer nVidia nVidia
Year June 2012 November 2010
Code Name GK107 GF110
Memory 2048 MB 3072 MB
Core Speed 900 MHz 772 MHz
Memory Speed 3564 MHz 4008 MHz
Power (Max TDP) 65 watts 244 watts
Bandwidth 57024 MB/sec 192384 MB/sec
Texel Rate 28800 Mtexels/sec 49408 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 37056 Mpixels/sec
Unified Shaders 384 512
Texture Mapping Units 32 64
Render Output Units 16 48
Bus Type DDR3 GDDR5
Bus Width 128-bit 384-bit
Fab Process 28 nm 40 nm
Transistors 1300 million 3000 million
Bus PCIe 3.0 x16 PCIe x16
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.2 OpenGL 4.1

Memory Bandwidth: Bandwidth is the max amount of data (in units of MB per second) that can be transferred over the external memory interface within a second. The number is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

GeForce GT 640 DDR3

GeForce GTX 580 3GB

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