The cost to produce Navi48 / 9070xt / 9070 at TSMC should be 42% more than the 7800xt - an upcharge going from $16,000(N5) vs $20,000(N4) for each 300mm wafer, and 346mm vs 390mm size increase. I get $151 for each 9070xt with an eventual 90% yield vs $106 for every 7800xt:
https://www.adapteva.com/white-papers/silicon-cost-calculator/
If AMD GPUs have a 40% margin (in Q4 of 2024 it was a paltry 17%) the price increase to AIBs (vs. 7800xt) might be around $63 more than the 7800xt when yields hit 90%, and $74 higher cost (vs. 7800xt) at retail (+ 12% AIB + 5% retail margins). The 7800xt is $480 at retail right now and they will need a price increase of $80-$90 for Navi48 and because of the extra power transistors, power connections, and possibly extra cooling. A $550 price is a money-loser (violating AMD's fiduciary responsibility to shareholders) but a $600 price is feasible.
They will lose money for a some time at $600 at initial 70% yields. The 9070xt price floor is $630-$640 at 70% yields.
Would you buy 95%+ of a 4080 for $600? I sure would!
The delay will give them a chance to increase yields from 70% to 90%, it will give them a chance to complete and release FSR4, and it will give NVidia a chance to screw up by under-supplying 5090 and 5080 cards, and it will reveal the ACTUAL $800+ and $600+ prices that NVidia AIBs will probably charge for 5070/Ti's; those NVidia price announcements are probably fiction.
Just FYI Intel is STILL 4 years behind AMD & NVidia. The cost to produce a B580 card is the same as the cost to produce a 4070. What a waste of good silicon!