Don't believe all the hype about PCIe - -

PCI-SIG: PCIe in 2017, PCIe in 2019 pcie 5 0 slot 2 PCIe SSD in a PCIe or a PCIe slot, in a system where the CPU does not have PCIe support and it will still work It will pcie 20 x16 slot It Looks Like PCIe NVMe SSDs Require Bigger Slots Forget 2280, the 25110 form factor could become the new normal when PCIe drives

pciex16 slot configuration This power supply's native PCIe port can provide 600W in power output This allows users to save four 8 pin connectors compared to when using adapter cables