Radeon R9 390 8G vs Radeon RX 6650 XT

Intro

Compare those specifications to the Radeon RX 6650 XT, which has a GPU core clock speed of 2055 MHz, and 8192 MB of GDDR6 RAM running at 2190 MHz through a 128-bit bus. It also features 2048 SPUs, 128 TAUs, and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6650 XT		176 Watts
Radeon R9 390 8G		275 Watts
	Difference: 99 Watts (56%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 390 8G should be 34% faster than the Radeon RX 6650 XT in general, due to its higher data rate. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon RX 6650 XT		287072 MB/sec
	Difference: 96928 (34%)

Texel Rate

The Radeon RX 6650 XT should be quite a bit (approximately 64%) faster with regards to AF than the Radeon R9 390 8G. (explain)

Radeon RX 6650 XT		263040 Mtexels/sec
Radeon R9 390 8G		160000 Mtexels/sec
	Difference: 103040 (64%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon RX 6650 XT is a better choice, by a large margin. (explain)

Radeon RX 6650 XT		131520 Mpixels/sec
Radeon R9 390 8G		64000 Mpixels/sec
	Difference: 67520 (106%)

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 maximum amount of data (measured in megabytes per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the bus width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.