I don't think AMD can afford putting the Nano @ $450.
But then again...the Nano will be released a while after everything else from how they made it sound like....thus there is PLENTY of room for them to first lower the price of the R9 390X after the first month to make room for the Nano.
Since its' performance is likely to beat the 970 above 1080P it can afford being more expensive...since it got 4 full GB of HBM as well, meanwhile the 970 will never have its' problem fixed.
I'd guess the MSRP for the 390X will drop a little after a very short while and then make room for the Nano.
Edit: I also forgot...390X comes with 8Gigs of GDDR5...this could also be a reasoning for price premium....390X and Nano might end up costing the same....it's not 100% unlikely....but this is Lisa Sus' first major GPU lineup release...so we will know her policy after the Nano is out...I guess
