https://wccftech.com/asrock-intros-first-rdna-2-mini-itx-graphics-card-the-radeon-rx-6600-xt-challenger-itx/

ASRock is the first and only manufacturer so far to offer AMD's RDNA 2 graphics cards in Mini-ITX form factor in the form of Radeon RX 6600 XT Challenger ITX. The Navi 23 GPU might be aimed at 1080p gamers but unfortunately, there's only one Mini ITX option to choose from if you are going to be using it in an SFF / Mini PC build.

While NVIDIA has several Mini-ITX variants of its GeForce RTX 3060 series available through its AIB partners, AMD only has one so far for the entire RDNA 2 lineup. ASRock seems to be the only AIB partner interested in offering both triple-fan full-length and single-fan half-length options with its Radeon RX 6600 XT Challenger ITX custom design.