GeForce RTX 4090 vs Radeon RX 6650 XT

Intro

Compare those specs to the Radeon RX 6650 XT, which makes use of a 7 nm design. AMD has clocked the core speed at 2055 MHz. The GDDR6 RAM works at a frequency of 2190 MHz on this particular model. It features 2048 SPUs as well as 128 Texture Address Units and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6650 XT		176 Watts
GeForce RTX 4090		450 Watts
	Difference: 274 Watts (156%)

Memory Bandwidth

In theory, the GeForce RTX 4090 is 263% faster than the Radeon RX 6650 XT overall, because of its greater data rate. (explain)

GeForce RTX 4090		1042432 MB/sec
Radeon RX 6650 XT		287072 MB/sec
	Difference: 755360 (263%)

Texel Rate

The GeForce RTX 4090 is quite a bit (about 335%) better at texture filtering than the Radeon RX 6650 XT. (explain)

GeForce RTX 4090		1144320 Mtexels/sec
Radeon RX 6650 XT		263040 Mtexels/sec
	Difference: 881280 (335%)

Pixel Rate

The GeForce RTX 4090 will be quite a bit (more or less 199%) more effective at AA than the Radeon RX 6650 XT, and also should be capable of handling higher resolutions while still performing well. (explain)

GeForce RTX 4090		393360 Mpixels/sec
Radeon RX 6650 XT		131520 Mpixels/sec
	Difference: 261840 (199%)

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 maximum amount of information (in units of MB per second) that can be moved past the external memory interface within a second. It is worked out by multiplying the interface width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the 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 maximum amount of pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.