Radeon HD 6990 vs Radeon RX 6650 XT

Intro

Compare those specifications to the Radeon RX 6650 XT, which has clock speeds of 2055 MHz on the GPU, and 2190 MHz on the 8192 MB of GDDR6 memory. It features 2048 SPUs as well as 128 Texture Address Units 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 little bit better than 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 will be a lot (about 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 will be quite a bit (about 148%) faster with regards to FSAA than the Radeon HD 6990, and will be able to handle higher 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 data (measured in megabytes per second) that can be moved past the external memory interface in a second. The number is worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output 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.