Radeon HD 6990 vs Radeon RX 6600

Intro

Compare all that to the Radeon RX 6600, which has GPU core speed of 1626 MHz, and 8192 MB of GDDR6 memory set to run at 1750 MHz through a 128-bit bus. It also is made up of 1792 SPUs, 112 Texture Address Units, and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6600		132 Watts
Radeon HD 6990		375 Watts
	Difference: 243 Watts (184%)

Memory Bandwidth

In theory, the Radeon HD 6990 will be 40% faster than the Radeon RX 6600 in general, because of its higher data rate. (explain)

Radeon HD 6990		320000 MB/sec
Radeon RX 6600		229376 MB/sec
	Difference: 90624 (40%)

Texel Rate

The Radeon RX 6600 will be a bit (approximately 14%) faster with regards to texture filtering than the Radeon HD 6990. (explain)

Radeon RX 6600		182112 Mtexels/sec
Radeon HD 6990		159360 Mtexels/sec
	Difference: 22752 (14%)

Pixel Rate

The Radeon RX 6600 is quite a bit (more or less 96%) more effective at anti-aliasing than the Radeon HD 6990, and capable of handling higher resolutions while still performing well. (explain)

Radeon RX 6600		104064 Mpixels/sec
Radeon HD 6990		53120 Mpixels/sec
	Difference: 50944 (96%)

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 maximum amount of information (in units of MB per second) that can be transported across 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 type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the graphics 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 that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.