GeForce GT 640 DDR3 vs Radeon RX 560

Intro

Compare that to the Radeon RX 560, which comes with GPU core speed of 1175 MHz, and 4096 MB of GDDR5 RAM set to run at 1750 MHz through a 128-bit bus. It also is made up of 1024 SPUs, 64 Texture Address Units, and 16 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 RX 560		80 Watts
	Difference: 15 Watts (23%)

Memory Bandwidth

As far as performance goes, the Radeon RX 560 should theoretically be much superior to the GeForce GT 640 DDR3 overall. (explain)

Radeon RX 560		114688 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 57664 (101%)

Texel Rate

The Radeon RX 560 is a lot (approximately 161%) more effective at texture filtering than the GeForce GT 640 DDR3. (explain)

Radeon RX 560		75200 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 46400 (161%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon RX 560 is the winner, and very much so. (explain)

Radeon RX 560		18800 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 4400 (31%)

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

Specifications

Memory Bandwidth: 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 worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.