Radeon HD 6990 vs Radeon RX 6650 XT

Intro

Compare all that to the Radeon RX 6650 XT, which has core speeds of 2055 MHz on the GPU, and 2190 MHz on the 8192 MB of GDDR6 memory. It features 2048 SPUs along with 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

Performance-wise, the Radeon HD 6990 should theoretically be a bit superior to the Radeon RX 6650 XT overall. (explain)

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

Texel Rate

The Radeon RX 6650 XT should be quite a bit (more or less 65%) better at 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 is a lot (more or less 148%) more effective at AA than the Radeon HD 6990, and should be able to handle higher screen resolutions better. (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 (counted in megabytes per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out 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 filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.