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GeForce GT 640 DDR3 vs GeForce GTX 580 3GB

Intro

The GeForce GT 640 DDR3 comes with a GPU core speed of 900 MHz, and the 2048 MB of DDR3 RAM is set to run at 1782 MHz through a 128-bit bus. It also features 384 Stream Processors, 32 TAUs, and 16 ROPs.

Compare those specs to the GeForce GTX 580 3GB, which makes use of a 40 nm design. nVidia has clocked the core speed at 772 MHz. The GDDR5 RAM runs at a speed of 1002 MHz on this particular card. It features 512 SPUs along with 64 Texture Address Units and 48 Rasterization Operator Units.

(No game benchmarks for this combination yet.)

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 should be quite a bit faster than the GeForce GT 640 DDR3 in general. (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 (more or less 72%) faster with regards to anisotropic 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

If running with a high screen resolution is important to you, then the GeForce GTX 580 3GB is a better choice, by far. (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

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.

GeForce GT 640 DDR3

Amazon.com

Other US-based stores

GeForce GTX 580 3GB

Amazon.com

Other US-based stores

Specifications

Model GeForce GT 640 DDR3 GeForce GTX 580 3GB
Manufacturer nVidia nVidia
Year June 2012 November 2010
Code Name GK107 GF110
Fab Process 28 nm 40 nm
Bus PCIe 3.0 x16 PCIe x16
Memory 2048 MB 3072 MB
Core Speed 900 MHz 772 MHz
Shader Speed 900 MHz 1544 MHz
Memory Speed 1782 MHz (3564 MHz effective) 1002 MHz (4008 MHz effective)
Unified Shaders 384 512
Texture Mapping Units 32 64
Render Output Units 16 48
Bus Type DDR3 GDDR5
Bus Width 128-bit 384-bit
DirectX Version DirectX 11.1 DirectX 11
OpenGL Version OpenGL 4.2 OpenGL 4.1
Power (Max TDP) 65 watts 244 watts
Shader Model 5.0 5.0
Bandwidth 57024 MB/sec 192384 MB/sec
Texel Rate 28800 Mtexels/sec 49408 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 37056 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be transported across the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the 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 number of texture map elements (texels) that can be applied per second. This figure 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 processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

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