Hi,I want to buy 2 PCI-E SSD, and I have 2 questions about this.1. Can I install 2 PCI-E x4 or only one x4 and the other is only x2?2. If I install an NVMe SSD (e.g. Samsung 970 EVO Plus) then from the 6 SATA ports I will be able to use only 4?THX ...