GeForce RTX 4090 vs Radeon RX 7900 XTX

Intro

Compare those specs to the Radeon RX 7900 XTX, which makes use of a 5 nm design. AMD has clocked the core speed at 1855 MHz. The GDDR6 memory is set to run at a speed of 2500 MHz on this specific model. It features 6144 SPUs as well as 384 Texture Address Units 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

In theory, the GeForce RTX 4090 should be 6% quicker than the Radeon RX 7900 XTX overall, due to 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 quite a bit (about 61%) more effective at 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

The GeForce RTX 4090 should be a small bit (about 10%) better at full screen anti-aliasing than the Radeon RX 7900 XTX, and will be able to handle higher screen resolutions more effectively. (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 maximum amount of data (in units of megabytes per second) that can be transported over the external memory interface within a second. The number is calculated by multiplying the interface width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster 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 texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, 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 card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel 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.