GeForce GT 640 DDR3 vs Radeon RX 560

Intro

Compare all of that to the Radeon RX 560, which features a core clock frequency of 1175 MHz and a GDDR5 memory speed of 1750 MHz. It also makes use of a 128-bit memory bus, and makes use of a 14 nm design. It is comprised of 1024 SPUs, 64 Texture Address Units, and 16 ROPs.

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

The Radeon RX 560 should in theory be quite a bit faster than the GeForce GT 640 DDR3 in general. (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 a high resolution is important to you, then the Radeon RX 560 is the winner, by far. (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: Memory bandwidth is the largest amount of information (measured in MB per second) that can be transferred across the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher 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 texture map elements (texels) that can be applied per second. This is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of 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 rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.