Radeon R9 M390X vs Radeon RX 6800 XT

Intro

Compare those specs to the Radeon RX 6800 XT, which comes with a GPU core clock speed of 1825 MHz, and 16384 MB of GDDR6 RAM set to run at 2000 MHz through a 256-bit bus. It also is comprised of 4608 Stream Processors, 288 TAUs, and 128 Raster Operation 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 much 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 quite a bit (about 468%) faster with regards to AF 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 (more or less 910%) faster with regards to FSAA than the Radeon R9 M390X, and also will be able to handle higher resolutions without losing too much performance. (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: Bandwidth is the largest amount of data (in units of megabytes per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 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 AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, 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 maximum number of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.