Page 24 of the manual states:

PCI-E Lane Distribution (44 Lane SKX CPU’s)

PE1 – x4 (Gen3, x4 lanes from PCH)

PE2 – x16 (Gen3, x16 lanes from CPU, x8 shared with PE3)

PE3 – x16 (Gen3, x8 lanes from CPU, shares 8 of PE2’s 16 lanes)

PE4 – x16 (Gen3, x8 lanes from CPU, shares 8 of PE5’s 16 lanes)

PE5 – x16 (Gen3, x16 lanes from CPU, x8 shared with PE4)

PE6 – x1 (Gen3, x1 lane from PCH)


So, yes.