Radeon R9 390 8G vs Radeon RX 7900 XTX

Intro

Compare those specifications to the Radeon RX 7900 XTX, which makes use of a 5 nm design. AMD has set the core frequency at 1855 MHz. The GDDR6 RAM runs at a frequency of 2500 MHz on this specific model. It features 6144 SPUs as well as 384 Texture Address Units and 192 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 390 8G		275 Watts
Radeon RX 7900 XTX		355 Watts
	Difference: 80 Watts (29%)

Memory Bandwidth

The Radeon RX 7900 XTX, in theory, should perform much faster than the Radeon R9 390 8G overall. (explain)

Radeon RX 7900 XTX		983040 MB/sec
Radeon R9 390 8G		384000 MB/sec
	Difference: 599040 (156%)

Texel Rate

The Radeon RX 7900 XTX will be a lot (more or less 345%) more effective at anisotropic filtering than the Radeon R9 390 8G. (explain)

Radeon RX 7900 XTX		712320 Mtexels/sec
Radeon R9 390 8G		160000 Mtexels/sec
	Difference: 552320 (345%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon RX 7900 XTX is the winner, and very much so. (explain)

Radeon RX 7900 XTX		356160 Mpixels/sec
Radeon R9 390 8G		64000 Mpixels/sec
	Difference: 292160 (457%)

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 information (measured in MB per second) that can be transferred across the external memory interface in one second. It's calculated by multiplying the bus width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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