MSI has listed an RTX 5080 24GB model on its website.
Spotted by TweakTown, a compatibility listing of MSI's X870 Tomahawk Wi-Fi motherboard features support for an Nvidia GeForce RTX 5080 model with "24576" under the Memory Size.
While it's unclear if this is an error or a sign of things to come, having a 24GB variant of the RTX 5080 could be beneficial for 4K gaming.
Having two options on the market, with a potential futureproofed 24GB model, allows consumers to choose based on their VRAM needs.