GeForce RTX 4080 vs Radeon RX 7900 XTX

Intro

Compare all that to the Radeon RX 7900 XTX, which comes with clock speeds of 1855 MHz on the GPU, and 2500 MHz on the 24576 MB of GDDR6 memory. It features 6144 SPUs along with 384 TAUs and 192 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce RTX 4080		320 Watts
Radeon RX 7900 XTX		355 Watts
	Difference: 35 Watts (11%)

Memory Bandwidth

Theoretically speaking, the Radeon RX 7900 XTX is 34% faster than the GeForce RTX 4080 overall, because of its greater data rate. (explain)

Radeon RX 7900 XTX		983040 MB/sec
GeForce RTX 4080		734003 MB/sec
	Difference: 249037 (34%)

Texel Rate

The Radeon RX 7900 XTX is just a bit (about 6%) better at anisotropic filtering than the GeForce RTX 4080. (explain)

Radeon RX 7900 XTX		712320 Mtexels/sec
GeForce RTX 4080		670320 Mtexels/sec
	Difference: 42000 (6%)

Pixel Rate

The Radeon RX 7900 XTX is much (about 44%) more effective at FSAA than the GeForce RTX 4080, and should be able to handle higher screen resolutions while still performing well. (explain)

Radeon RX 7900 XTX		356160 Mpixels/sec
GeForce RTX 4080		246960 Mpixels/sec
	Difference: 109200 (44%)

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 largest amount of information (in units of MB per second) that can be moved over the external memory interface in a second. It is worked out by multiplying the bus width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. 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 number of texture map elements (texels) that are applied per second. This number is worked out by multiplying the total texture units by the core speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.