Radeon R9 M390X vs Radeon RX 6800 XT

Intro

Compare all that to the Radeon RX 6800 XT, which comes with core clock speeds of 1825 MHz on the GPU, and 2000 MHz on the 16384 MB of GDDR6 memory. It features 4608 SPUs along with 288 Texture Address Units and 128 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
Radeon RX 6800 XT		300 Watts
	Difference: 175 Watts (140%)

Memory Bandwidth

The Radeon RX 6800 XT should theoretically perform quite a bit faster than the Radeon R9 M390X in general. (explain)

Radeon RX 6800 XT		524288 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 364288 (228%)

Texel Rate

The Radeon RX 6800 XT should be a lot (more or less 468%) faster with regards to texture filtering than the Radeon R9 M390X. (explain)

Radeon RX 6800 XT		525600 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 433056 (468%)

Pixel Rate

The Radeon RX 6800 XT will be a lot (approximately 910%) better at anti-aliasing than the Radeon R9 M390X, and also should be able to handle higher resolutions more effectively. (explain)

Radeon RX 6800 XT		233600 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 210464 (910%)

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

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be transported past the external memory interface in one second. It's calculated by multiplying the bus width by its memory clock speed. In the case of DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, 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 are applied per second. This is calculated by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. The number 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 drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.