Radeon HD 7990 vs Radeon RX 6600

Intro

Compare that to the Radeon RX 6600, which comes with clock speeds of 1626 MHz on the GPU, and 1750 MHz on the 8192 MB of GDDR6 memory. It features 1792 SPUs as well as 112 TAUs and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6600		132 Watts
Radeon HD 7990		375 Watts
	Difference: 243 Watts (184%)

Memory Bandwidth

The Radeon HD 7990, in theory, should perform quite a bit faster than the Radeon RX 6600 overall. (explain)

Radeon HD 7990		576000 MB/sec
Radeon RX 6600		229376 MB/sec
	Difference: 346624 (151%)

Texel Rate

The Radeon HD 7990 will be a lot (approximately 34%) more effective at AF than the Radeon RX 6600. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon RX 6600		182112 Mtexels/sec
	Difference: 61088 (34%)

Pixel Rate

If using a high resolution is important to you, then the Radeon RX 6600 is superior to the Radeon HD 7990, and very much so. (explain)

Radeon RX 6600		104064 Mpixels/sec
Radeon HD 7990		60800 Mpixels/sec
	Difference: 43264 (71%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the max amount of information (counted in megabytes per second) that can be transferred past the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 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 number of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card 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 the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.