Radeon HD 6990 vs Radeon RX 6600

Intro

Compare those specs to the Radeon RX 6600, which features a GPU core clock speed of 1626 MHz, and 8192 MB of GDDR6 RAM running at 1750 MHz through a 128-bit bus. It also is made up of 1792 Stream Processors, 112 Texture Address Units, and 64 ROPs.

Display Graphs

Hide Graphs

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

Performance-wise, the Radeon HD 6990 should theoretically be much better than the Radeon RX 6600 in general. (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 small bit (about 14%) better at AF 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 much (more or less 96%) faster with regards to AA than the Radeon HD 6990, and should be capable of handling higher screen resolutions without slowing down too much. (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 moved across the external memory interface in one second. The number is worked out by multiplying the bus width by its memory speed. If it uses DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster 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 are applied per second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.