One is x86 based the other is ARM based (arm is more efficient)
One has 8GB of DDR3 and ESRAM consuming tons of power the other does not.
There is a huge efficiency difference between GCN and Maxwell due to a 2 year time gap.
One is fabbed on TSMC 28nm the other on TSMC 20nm.
All with all there are various reasons why this could be the case. But why compare to the Xbox1 and not the PS4. (probably because X(box) one sounds like X1)
They should've named it M1 to be honest.
Edited by maarten12100 - 1/5/15 at 1:37am