AMD Radeon RX 6900XT and RX 6800XT have a lot in common. The cards share the same clock speeds: 2015 MHz game clock and 2250 MHz boost clock. The SKUs also share the same memory layout: 16GB GDDR6 256-bit. More importantly, though, these cards use the same Navi 21 GPU with the same power requirements (300W). Thus, a custom Radeon RX 6900XT design would require very limited resources from AMD partners, as the board designs are ready, and cooling solutions are already preconfigured for the same power envelope.
AMD is in talks with partners about custom models of the Radeon RX 6900 XT. So far, there is just a MBA (made by AMD) planed, but obviously partners are interested in offering own designs with custom coolers. pic.twitter.com/LTrWySzua4— Andreas Schilling (@aschilling) October 30, 2020