Hi, while I am searching for memory for my system, I noticed that Z390 motherboards only support dual channel but can remain stable with faster RAM at 4000. Together with i9-9900K, will such system be faster than X299 system with quad channels RAM of 3200? What are the advantageous of going for Z390 and 9900K? I think the i9-9900K is as hot as the 7900X but the latter has more PCI lanes.