GeForce GTX 660 vs Radeon RX 6650 XT

Intro

Compare that to the Radeon RX 6650 XT, which uses a 7 nm design. AMD has set the core frequency at 2055 MHz. The GDDR6 memory is set to run at a speed of 2190 MHz on this particular model. It features 2048 SPUs as well as 128 Texture Address Units and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660		140 Watts
Radeon RX 6650 XT		176 Watts
	Difference: 36 Watts (26%)

Memory Bandwidth

In theory, the Radeon RX 6650 XT will be 99% faster than the GeForce GTX 660 overall, because of its greater bandwidth. (explain)

Radeon RX 6650 XT		287072 MB/sec
GeForce GTX 660		144192 MB/sec
	Difference: 142880 (99%)

Texel Rate

The Radeon RX 6650 XT is much (approximately 236%) more effective at texture filtering than the GeForce GTX 660. (explain)

Radeon RX 6650 XT		263040 Mtexels/sec
GeForce GTX 660		78400 Mtexels/sec
	Difference: 184640 (236%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon RX 6650 XT is a better choice, by far. (explain)

Radeon RX 6650 XT		131520 Mpixels/sec
GeForce GTX 660		23520 Mpixels/sec
	Difference: 108000 (459%)

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 data (measured in megabytes per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the card's interface width by its memory speed. In the case of DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.