GeForce RTX 4090 vs Radeon RX 7900 XTX

Intro

Compare all of that to the Radeon RX 7900 XTX, which comes with a clock speed of 1855 MHz and a GDDR6 memory frequency of 2500 MHz. It also makes use of a 384-bit memory bus, and uses a 5 nm design. It is made up of 6144 SPUs, 384 TAUs, and 192 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 7900 XTX		355 Watts
GeForce RTX 4090		450 Watts
	Difference: 95 Watts (27%)

Memory Bandwidth

Theoretically speaking, the GeForce RTX 4090 will be 6% faster than the Radeon RX 7900 XTX in general, because of its greater bandwidth. (explain)

GeForce RTX 4090		1042432 MB/sec
Radeon RX 7900 XTX		983040 MB/sec
	Difference: 59392 (6%)

Texel Rate

The GeForce RTX 4090 is a lot (more or less 61%) faster with regards to anisotropic filtering than the Radeon RX 7900 XTX. (explain)

GeForce RTX 4090		1144320 Mtexels/sec
Radeon RX 7900 XTX		712320 Mtexels/sec
	Difference: 432000 (61%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce RTX 4090 is a better choice, not by a very large margin though. (explain)

GeForce RTX 4090		393360 Mpixels/sec
Radeon RX 7900 XTX		356160 Mpixels/sec
	Difference: 37200 (10%)

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 (measured in megabytes per second) that can be transferred past the external memory interface in one second. It's calculated by multiplying the interface width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total amount of texture units of the card 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 processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.