Radeon HD 6990 vs Radeon RX 6650 XT

Intro

Compare that to the Radeon RX 6650 XT, which comes with a core clock frequency of 2055 MHz and a GDDR6 memory speed of 2190 MHz. It also makes use of a 128-bit memory bus, and makes use of a 7 nm design. It is made up of 2048 SPUs, 128 TAUs, and 64 Raster Operation Units.

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 in theory be just a bit better than the Radeon RX 6650 XT in general. (explain)

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

Texel Rate

The Radeon RX 6650 XT is a lot (more or less 65%) better at AF 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%) better at AA than the Radeon HD 6990, and will be able to handle higher resolutions more effectively. (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 largest amount of data (in units of megabytes per second) that can be transferred past the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, 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 that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.