This is very concerning if this end up being true, since this means at least hypothetically there will be a 50% performance gap between 5090 and the 5080.

Which unless 5080 is really cheap (which it most definitely wont) will never be a price perfomant card.

Instead you'll have to wait until the super ti version comes out.

For reference the 4090 and the 4080 differences is between 15-30%.

Dual RTX 5090s and you’ll want a dedicated 20 amp breaker just for your workstation and misc. electronics.