Radeon HD 6990 vs Radeon RX 6500 XT

Intro

Compare all of that to the Radeon RX 6500 XT, which has GPU clock speed of 2200 MHz, and 4096 MB of GDDR6 memory set to run at 2250 MHz through a 64-bit bus. It also is comprised of 1024 SPUs, 64 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6500 XT		107 Watts
Radeon HD 6990		375 Watts
	Difference: 268 Watts (250%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6990 should in theory be a lot superior to the Radeon RX 6500 XT in general. (explain)

Radeon HD 6990		320000 MB/sec
Radeon RX 6500 XT		147456 MB/sec
	Difference: 172544 (117%)

Texel Rate

The Radeon HD 6990 will be a bit (about 13%) more effective at texture filtering than the Radeon RX 6500 XT. (explain)

Radeon HD 6990		159360 Mtexels/sec
Radeon RX 6500 XT		140800 Mtexels/sec
	Difference: 18560 (13%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon RX 6500 XT is the winner, by far. (explain)

Radeon RX 6500 XT		70400 Mpixels/sec
Radeon HD 6990		53120 Mpixels/sec
	Difference: 17280 (33%)

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 largest amount of information (counted in MB per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the interface width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs 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 output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.