Radeon HD 6790 vs Radeon RX 6600 XT

Intro

Compare those specifications to the Radeon RX 6600 XT, which features GPU core speed of 1968 MHz, and 8192 MB of GDDR6 memory set to run at 2000 MHz through a 128-bit bus. It also is made up of 2048 Stream Processors, 128 Texture Address Units, and 64 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6790		150 Watts
Radeon RX 6600 XT		160 Watts
	Difference: 10 Watts (7%)

Memory Bandwidth

Performance-wise, the Radeon RX 6600 XT should theoretically be a lot better than the Radeon HD 6790 in general. (explain)

Radeon RX 6600 XT		262144 MB/sec
Radeon HD 6790		134400 MB/sec
	Difference: 127744 (95%)

Texel Rate

The Radeon RX 6600 XT is much (about 650%) more effective at AF than the Radeon HD 6790. (explain)

Radeon RX 6600 XT		251904 Mtexels/sec
Radeon HD 6790		33600 Mtexels/sec
	Difference: 218304 (650%)

Pixel Rate

The Radeon RX 6600 XT should be much (more or less 837%) faster with regards to anti-aliasing than the Radeon HD 6790, and also should be able to handle higher resolutions without losing too much performance. (explain)

Radeon RX 6600 XT		125952 Mpixels/sec
Radeon HD 6790		13440 Mpixels/sec
	Difference: 112512 (837%)

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 maximum amount of data (in units of MB 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 its memory clock speed. If it uses DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the graphics 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 most pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.