Radeon HD 6990 vs Radeon RX 6650 XT

Intro

Compare all of that to the Radeon RX 6650 XT, which features a GPU core clock speed of 2055 MHz, and 8192 MB of GDDR6 RAM running at 2190 MHz through a 128-bit bus. It also is made up of 2048 SPUs, 128 TAUs, and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6650 XT		176 Watts
Radeon HD 6990		375 Watts
	Difference: 199 Watts (113%)

Memory Bandwidth

In theory, the Radeon HD 6990 will be 11% faster than the Radeon RX 6650 XT overall, because of its higher bandwidth. (explain)

Radeon HD 6990		320000 MB/sec
Radeon RX 6650 XT		287072 MB/sec
	Difference: 32928 (11%)

Texel Rate

The Radeon RX 6650 XT will be much (more or less 65%) faster with regards to texture filtering than the Radeon HD 6990. (explain)

Radeon RX 6650 XT		263040 Mtexels/sec
Radeon HD 6990		159360 Mtexels/sec
	Difference: 103680 (65%)

Pixel Rate

The Radeon RX 6650 XT should be much (about 148%) better at anti-aliasing than the Radeon HD 6990, and capable of handling higher resolutions while still performing well. (explain)

Radeon RX 6650 XT		131520 Mpixels/sec
Radeon HD 6990		53120 Mpixels/sec
	Difference: 78400 (148%)

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 (in units of megabytes per second) that can be moved over the external memory interface in a second. The number is calculated by multiplying the interface width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 again. If 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 processed per second. This is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

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