When I check here [ at a random Z87 boards cpu support list ]http://www.asrock.com/mb/Intel/Z87%20Extreme4/?cat=CPU
The Xeon is supported , but the Z87 chipset does not support ECC RAM
I think that must mean the XEON can make use of ECC RAM if its in a motherboard with a suitable chipset
But runs fine with regular RAM ????
I dont know for sure though