That I wasn't aware of.
In either case, it seems I linked an outdated version of it. Here is the more recent (and still available) one: http://www.quietpc.com/gb-en-gbp/pro...ms/sys-a43-z68
At glance, it does look like the second and third of the PCI-E ports on the Gigabyte GA-Z68MX-UD2H-B3 aren't blocked by the massive heatsink. So add something like an ASUS ENGT440 and you got a decent system that is, apart from the Blu-Ray writer and the HDD (you could go for only SSDs though), absolutely silent.