there is no reference.
this image show that the scaler should be the good old lanczos 3 with maybe AR in very low quality (the banding).
here is mpcvr jinc2m
https://abload.de/img/jinc2l9ezb.png
which is flawless no bands or discontinuities.
this just a pattern that roughly tells you the scaler and shows error in it. the band seen in your intel results could be pointless if you are only scaling x2.