Empty PCI-e slots? Why would you build ATX if you were going to have empty PCI-e slots? =)
Mine are all filled.
1 and 2 are used by the GPU
3 is my 10Gig-e card
4 is a pci-e SSD
5 is another pci-e SSD...
You obviously did not read all of my recent posting above, outlining the limitations of current SFX-L PSUs in regards to ThreadRipper / Vega builds...
Most recent ATX motherboards have 2 or 3 M.2 slots, so no need for PCIe SSDs...
And the vast majority of ATX motherboard users really do not have more than one GPU installed, two at most (SLI or CrossFireX), with the remaining PCIe slots sitting empty...
And, by design, the chassis, if used for water cooling with a 240mm radiator up top, precludes the use of the last few slots on the motherboard...
For me, for this chassis, for my projected usage, putting an (optional) external reservoir over unused PCIe slots makes total sense...