You're forgetting that the XSX is an entire APU system running at around 200-240W. So the GPU portion isn't unoptimised, it's undervolted and underclocked compared to a dGPU. The 5700 XT on its own is a 225W card. Oh, and the XSX was comparable to a 2080 Super.It was around 2080 performance I thought but that was with an unoptimised version? Which to be fair did not impress me at all because the 40 CU 5700XT is only ~20% slower than a 2080 at 4K. So if the 52 CU Xbox X GPU was only 20% faster then it must have been seriously unoptimised.
If 72 RDNA 2 CUs given a discrete card's power budget and clock speed can only get around a 3080 in performance then AMD have done something terribly wrong. 50% performance per watt uplift and IPC improvements would see 40 RDNA 2 CUs at 225W beat the 2080 Ti by about 15% - that's right, AMD's midrange 5700 XT successor also beats the 2080 Ti just like Nvidia. And that's just 40 CUs. Slap on 80% more and the 3080 could be given quite the smacking in the chops.If it is 72CU or higher coupled with better clocks and the architecture improvements for RDNA2 then I would anticipate around 3080 levels of performance. So if you set your sights at that level of performance then anything else is a bonus.
So yes, I am anticipating Big Navi to trade blows with the 3080, but with a chunk fewer than 72 CUs, which allows AMD the leeway to actually release a halo product for stupid money if they so choose, or at least counter the inevitable 3080 Ti (or 3090 12GB as it's likely to be called) Nvidia will release should the 3080 be beaten.