GeForce RTX 3080 12 GB vs Radeon R9 M390X

Intro

Compare those specs to the Radeon R9 M390X, which has a GPU core clock speed of 723 MHz, and 4096 MB of GDDR5 memory running at 1250 MHz through a 256-bit bus. It also is comprised of 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X		125 Watts
GeForce RTX 3080 12 GB		350 Watts
	Difference: 225 Watts (180%)

Memory Bandwidth

Theoretically speaking, the GeForce RTX 3080 12 GB is 484% faster than the Radeon R9 M390X overall, because of its higher bandwidth. (explain)

GeForce RTX 3080 12 GB		934298 MB/sec
Radeon R9 M390X		160000 MB/sec
	Difference: 774298 (484%)

Texel Rate

The GeForce RTX 3080 12 GB is quite a bit (about 281%) more effective at texture filtering than the Radeon R9 M390X. (explain)

GeForce RTX 3080 12 GB		352800 Mtexels/sec
Radeon R9 M390X		92544 Mtexels/sec
	Difference: 260256 (281%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce RTX 3080 12 GB is superior to the Radeon R9 M390X, and very much so. (explain)

GeForce RTX 3080 12 GB		141120 Mpixels/sec
Radeon R9 M390X		23136 Mpixels/sec
	Difference: 117984 (510%)

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 max amount of data (in units of MB per second) that can be moved over the external memory interface in one second. The number is calculated by multiplying the bus width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This is worked out 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.