[quotemsg=20637600,0,1696401][quotemsg=20634801,0,1396902]So where is hot air exhausting? If the top vent is a duct to your GPU as an intake, the rear is also pulling air in, then where is the hot air going? Is it all going out through the PSU? If so, seems like the PSU's longevity might be shortened. Plus, that seems like it would create hot spots as the hot air will rise (unless somehow the air being pushed out by the GPU's fans - if it's not a blower-style venting out - is somehow creating a flow of air going down).
I see holes on the side where the motherboard would lie; however, that seems really inefficient as it's covered by the m/b.
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The air gets pushed out through several places, including the side panel, the small vent in back, the ATX-SFX PSU adapter plate, and of course the PSU itself. The graphics card also vents at least 1/3 of it's hot air through it's own PCI slot bracket. The Corsair SF450 PSU is semi-passive and we have yet to even see the PSU fan turn on outside of running a torture test right after assembly. This is with a 65W i7-7700 CPU and Gigabyte GTX1070 mini.[/quotemsg]
So are you using the vented side panel from the Metis "Classic" instead of the new one with the non-vented acrylic window? If so, my guess is that the vented side panel is where the majority of the hot air is exhausting.
I also agree with making a SFX PSU standard for this case. Internal space always helps when you're building a smaller case.