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Radeon R9 Nano vs Radeon RX 6800 XT

Intro

The Radeon R9 Nano comes with a clock frequency of 1000 MHz and a HBM memory frequency of 500 MHz. It also uses a 4096-bit memory bus, and uses a 28 nm design. It is comprised of 4096 SPUs, 256 Texture Address Units, and 64 Raster Operation Units.

Compare all that to the Radeon RX 6800 XT, which makes use of a 7 nm design. AMD has set the core frequency at 1825 MHz. The GDDR6 RAM is set to run at a frequency of 2000 MHz on this model. It features 4608 SPUs along with 288 TAUs and 128 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 Nano		175 Watts
Radeon RX 6800 XT		300 Watts
	Difference: 125 Watts (71%)

Memory Bandwidth

In theory, the Radeon RX 6800 XT should be a small bit faster than the Radeon R9 Nano in general. (explain)

Radeon RX 6800 XT		524288 MB/sec
Radeon R9 Nano		512000 MB/sec
	Difference: 12288 (2%)

Texel Rate

The Radeon RX 6800 XT will be a lot (approximately 105%) better at texture filtering than the Radeon R9 Nano. (explain)

Radeon RX 6800 XT		525600 Mtexels/sec
Radeon R9 Nano		256000 Mtexels/sec
	Difference: 269600 (105%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon RX 6800 XT is superior to the Radeon R9 Nano, by a large margin. (explain)

Radeon RX 6800 XT		233600 Mpixels/sec
Radeon R9 Nano		64000 Mpixels/sec
	Difference: 169600 (265%)

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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Radeon R9 Nano

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Radeon RX 6800 XT

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Specifications

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Model	Radeon R9 Nano	Radeon RX 6800 XT
Manufacturer	AMD	AMD
Year	September 2015	November 2020
Code Name	Fiji XT	Navi 21
Memory	4096 MB	16384 MB
Core Speed	1000 MHz	1825 MHz
Memory Speed	500 MHz	4000 GB/s
Power (Max TDP)	175 watts	300 watts
Bandwidth	512000 MB/sec	524288 MB/sec
Texel Rate	256000 Mtexels/sec	525600 Mtexels/sec
Pixel Rate	64000 Mpixels/sec	233600 Mpixels/sec
Unified Shaders	4096	4608
Texture Mapping Units	256	288
Render Output Units	64	128
Bus Type	HBM	GDDR6
Bus Width	4096-bit	256-bit
Fab Process	28 nm	7 nm
Transistors	8900 million	26800 million
Bus	PCIe 3.0 x16	PCIe 4.0 x16
DirectX Version	DirectX 12.0	DirectX 12
OpenGL Version	OpenGL 4.5	OpenGL 4.6

Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be moved past the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

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