Radeon R9 390 8G vs Radeon RX 6750 XT

Intro

Compare those specifications to the Radeon RX 6750 XT, which has a core clock frequency of 2150 MHz and a GDDR6 memory frequency of 2250 MHz. It also features a 192-bit bus, and uses a 7 nm design. It is comprised of 2560 SPUs, 160 Texture Address Units, and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6750 XT		250 Watts
Radeon R9 390 8G		275 Watts
	Difference: 25 Watts (10%)

Memory Bandwidth

The Radeon RX 6750 XT should in theory be a bit faster than the Radeon R9 390 8G in general. (explain)

Radeon RX 6750 XT		442368 MB/sec
Radeon R9 390 8G		384000 MB/sec
	Difference: 58368 (15%)

Texel Rate

The Radeon RX 6750 XT should be much (about 115%) more effective at texture filtering than the Radeon R9 390 8G. (explain)

Radeon RX 6750 XT		344000 Mtexels/sec
Radeon R9 390 8G		160000 Mtexels/sec
	Difference: 184000 (115%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon RX 6750 XT is the winner, by a large margin. (explain)

Radeon RX 6750 XT		137600 Mpixels/sec
Radeon R9 390 8G		64000 Mpixels/sec
	Difference: 73600 (115%)

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 MB per second) that can be transferred over the external memory interface in a second. The number is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, 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 amount of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core 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 is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.