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GeForce GT 640 DDR3 vs Radeon HD 5850

Intro

The GeForce GT 640 DDR3 comes with clock speeds of 900 MHz on the GPU, and 1782 MHz on the 2048 MB of DDR3 memory. It features 384 SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

Compare that to the Radeon HD 5850, which comes with GPU clock speed of 725 MHz, and 1024 MB of GDDR5 RAM running at 1000 MHz through a 256-bit bus. It also features 1440(288x5) Stream Processors, 72 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3 65 Watts
Radeon HD 5850 151 Watts
Difference: 86 Watts (132%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5850 should be quite a bit faster than the GeForce GT 640 DDR3 in general. (explain)

Radeon HD 5850 128000 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 70976 (124%)

Texel Rate

The Radeon HD 5850 will be much (more or less 81%) more effective at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

Radeon HD 5850 52200 Mtexels/sec
GeForce GT 640 DDR3 28800 Mtexels/sec
Difference: 23400 (81%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 5850 is the winner, and very much so. (explain)

Radeon HD 5850 23200 Mpixels/sec
GeForce GT 640 DDR3 14400 Mpixels/sec
Difference: 8800 (61%)

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

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GeForce GT 640 DDR3

Amazon.com

Radeon HD 5850

Amazon.com

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model GeForce GT 640 DDR3 Radeon HD 5850
Manufacturer nVidia AMD
Year June 2012 September 30, 2009
Code Name GK107 Cypress PRO
Memory 2048 MB 1024 MB
Core Speed 900 MHz 725 MHz
Memory Speed 3564 MHz 4000 MHz
Power (Max TDP) 65 watts 151 watts
Bandwidth 57024 MB/sec 128000 MB/sec
Texel Rate 28800 Mtexels/sec 52200 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 23200 Mpixels/sec
Unified Shaders 384 1440(288x5)
Texture Mapping Units 32 72
Render Output Units 16 32
Bus Type DDR3 GDDR5
Bus Width 128-bit 256-bit
Fab Process 28 nm 40 nm
Transistors 1300 million 2154 million
Bus PCIe 3.0 x16 PCIe 2.1 x16
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.2 OpenGL 3.2

Memory Bandwidth: Memory bandwidth is the largest amount of information (measured in MB per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the bus width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. 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 number of texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

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

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