GeForce RTX 4080 vs Radeon RX 7900 XTX

Intro

Compare all that to the Radeon RX 7900 XTX, which has clock speeds of 1855 MHz on the GPU, and 2500 MHz on the 24576 MB of GDDR6 RAM. 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

The Radeon RX 7900 XTX should in theory perform much faster than the GeForce RTX 4080 in general. (explain)

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

Texel Rate

The Radeon RX 7900 XTX will be just a bit (approximately 6%) better at AF 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 (more or less 44%) better at FSAA than the GeForce RTX 4080, and should be capable of handling higher screen resolutions better. (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: Bandwidth is the largest amount of data (in units of megabytes per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR type RAM, it must be multiplied by 2 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 number of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

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