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GeForce GTX 980 vs Radeon RX 6600 XT

Intro

The GeForce GTX 980 has a clock speed of 1126 MHz and a GDDR5 memory frequency of 1750 MHz. It also makes use of a 256-bit bus, and makes use of a 28 nm design. It features 2048 SPUs, 128 TAUs, and 64 ROPs.

Compare those specs to the Radeon RX 6600 XT, which comes with GPU core speed of 1968 MHz, and 8192 MB of GDDR6 memory set to run at 2000 MHz through a 128-bit bus. It also is comprised of 2048 Stream Processors, 128 Texture Address Units, and 64 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6600 XT		160 Watts
GeForce GTX 980		165 Watts
	Difference: 5 Watts (3%)

Memory Bandwidth

As far as performance goes, the Radeon RX 6600 XT should theoretically be just a bit superior to the GeForce GTX 980 overall. (explain)

Radeon RX 6600 XT		262144 MB/sec
GeForce GTX 980		224000 MB/sec
	Difference: 38144 (17%)

Texel Rate

The Radeon RX 6600 XT is much (about 75%) better at anisotropic filtering than the GeForce GTX 980. (explain)

Radeon RX 6600 XT		251904 Mtexels/sec
GeForce GTX 980		144128 Mtexels/sec
	Difference: 107776 (75%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon RX 6600 XT is a better choice, by a large margin. (explain)

Radeon RX 6600 XT		125952 Mpixels/sec
GeForce GTX 980		72064 Mpixels/sec
	Difference: 53888 (75%)

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.

Price Comparison

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GeForce GTX 980

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Radeon RX 6600 XT

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Specifications

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Model	GeForce GTX 980	Radeon RX 6600 XT
Manufacturer	nVidia	AMD
Year	September 2014	August 2021
Code Name	GM204-400	Navi 23 XT
Memory	4096 MB	8192 MB
Core Speed	1126 MHz	1968 MHz
Memory Speed	7000 MHz	4000 GB/s
Power (Max TDP)	165 watts	160 watts
Bandwidth	224000 MB/sec	262144 MB/sec
Texel Rate	144128 Mtexels/sec	251904 Mtexels/sec
Pixel Rate	72064 Mpixels/sec	125952 Mpixels/sec
Unified Shaders	2048	2048
Texture Mapping Units	128	128
Render Output Units	64	64
Bus Type	GDDR5	GDDR6
Bus Width	256-bit	128-bit
Fab Process	28 nm	7 nm
Transistors	5200 million	11060 million
Bus	PCIe 3.0 x16	PCIe 4.0 x16
DirectX Version	DirectX 11.2	DirectX 12
OpenGL Version	OpenGL 4.5	OpenGL 4.6

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in MB per second) that can be transferred past the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher 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 amount of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at 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 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 core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant 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.

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