Radeon R9 M390X vs Radeon RX 6800 XT

Intro

Compare those specifications to the Radeon RX 6800 XT, which has GPU clock speed of 1825 MHz, and 16384 MB of GDDR6 memory set to run at 2000 MHz through a 256-bit bus. It also features 4608 Stream Processors, 288 TAUs, and 128 Raster Operation Units.

Display Graphs

Hide Graphs

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 overall. (explain)

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

Texel Rate

The Radeon RX 6800 XT is quite a bit (approximately 468%) better at 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

If using lots of anti-aliasing is important to you, then the Radeon RX 6800 XT is superior to the Radeon R9 M390X, by far. (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 largest amount of data (measured in megabytes per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the interface width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's 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 amount of texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.