Isn't the skylake iris 540 similar to the old iris pro - I.e it has embedded memory?
It does, but Skylake's 540 Iris has 64 eDRAM vs 128 on the Haswell Iris Pro. There is a breakdown here: https://en.wikipedia.org/wiki/Intel_HD_and_Iris_Graphics
So not sure how much that will affect performance. Clock speeds also seem to be unknown so it's hard to make any guesses.