There's a polish site that tested Iris Xe Max. It's 5% faster than the Xe iGPU in the Asus UX425E, which based on Witcher test uses 20W less and cuts battery life normalized to Whr by a significant amount. Meaning 5% faster than the Xe iGPU set at 17W or less.
Seems like an awful lot of hoops for nothing. They truly needed the Xe to shine, because the gains weren't going to be special(AMD/Nvidia/IMG all promised big gains) to them.
Yet it disappoints. Tigerlake Xe goes from 2x to "Up to 2x, but 70% really, and in optimal configurations". And the Xe Max, I hoped for performance akin to optimal Tigerlake configuration set at 25W, but nope.
The LPDDR4x usage is a fail IMO. The low load power will always be better on iGPUs. Perhaps the Xe is still not power efficient to pair it with GDDR6. At least it would have been faster.
This does not bode well for their high end, where it won't compete with outdated competition.