GeForce GTX 660 vs Radeon RX 6800 XT

Intro

Compare those specifications to the Radeon RX 6800 XT, which has GPU clock speed of 1825 MHz, and 16384 MB of GDDR6 RAM running at 2000 MHz through a 256-bit bus. It also is made up of 4608 SPUs, 288 TAUs, and 128 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660		140 Watts
Radeon RX 6800 XT		300 Watts
	Difference: 160 Watts (114%)

Memory Bandwidth

In theory, the Radeon RX 6800 XT will be 264% faster than the GeForce GTX 660 in general, due to its greater data rate. (explain)

Radeon RX 6800 XT		524288 MB/sec
GeForce GTX 660		144192 MB/sec
	Difference: 380096 (264%)

Texel Rate

The Radeon RX 6800 XT will be much (more or less 570%) faster with regards to anisotropic filtering than the GeForce GTX 660. (explain)

Radeon RX 6800 XT		525600 Mtexels/sec
GeForce GTX 660		78400 Mtexels/sec
	Difference: 447200 (570%)

Pixel Rate

The Radeon RX 6800 XT should be quite a bit (approximately 893%) more effective at full screen anti-aliasing than the GeForce GTX 660, and also should be able to handle higher resolutions without losing too much performance. (explain)

Radeon RX 6800 XT		233600 Mpixels/sec
GeForce GTX 660		23520 Mpixels/sec
	Difference: 210080 (893%)

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 max amount of data (counted in megabytes per second) that can be moved across the external memory interface within a second. The number is calculated by multiplying the interface width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.