So theres something Im having doubts about and that is that the XTX die, AMD exclusive, is either the only full die (80CUS) or a higher binned full die.
If its a higher binned die, the performance delta over the remaining full dies wont be that large I imagine. The 5700xt lisa su edition was clocked higher out of the box but ultimately once overclocked it was the same as every other 5700xt. This leads me to believe that a higher binned full 80cu die would be similar, in that aib models might well clock and perform beyond it. and if thats the case why bother with the subterfuge of not letting aibs know about it.
If its the only full 80cu die and the partner cards are getting the 72cu cut down version, there would be far fewer cut down dies than full. Almost 2:1 based on TSMC's reported defect density of 0.09 and coreteks die size estimate. AMD arnt going to send full dies with limited bioses to meet demand. And the AIB would know its not a fully functional die. Again why bother with the subterfuge when it would probably be obvious. Also, with regards to the naming scheme, AMD have always historically called the full die of a segment the XT, and the cut down version the non-xt. Why would a cut down die be the 6800xt. This supply limitation would also be exasperated by needing to have dies cut down by 20% (64cu) to fit a 6800
Really the better solution would be to have a 64cu full die, with a 56 cut down die, and a 80cu die with a 72cu cut down die. This leads me to believe that the board partner cards are the 64cu 6800xt full die. The 56cu die may not yet have been sampled to board partners. This is also probably the 2 fan design weve seen
The 80cu and 72cu cut down are the amd exclusive, the 6900xt and 6900. That is the only thing that makes sense with regards to AMD not letting board partners have the chips. This would be the 3 fan design
Some may point to lisa su holding on stage a 3 slot card, calling it big navi and showing benches that are below to on par with the 3080. It may have been the 72cu version the benches were from. But big navi is just a bigger chip than navi10 die, 251mm2
Also I would add that the rumored size of navi22, 340mm2 is much too large for a 40cu die, infact it is more unaccounted for space than its larger sibling the 80cu 500mm2
One more point Id like to add, and that is the benches show at the zen3 event. I would suggest they are by a 64cu card running at 2.2ghz. We know the XBSX benches in gears5 10% slower than a 2080ti. A 64cu die would have 23% more cu's than the XBSX, and at 2.2 ghz it would have 20% higher clocks. So assuming 2080ti = 100, XBSX = 90, then 64cu 2.2ghz card would be 132(90x1.23x1.2). Ballpark 3080 figures