This is due to Digitec's "Dynamic Pricing" policy :)
If you already feel cheated because of the 6.-, then you really shouldn't shop at Digitec anymore, with some products the fluctuations are much more extreme...
Hi. Improvements/extensions to ports, fan control, power supply cover etc.etc. See: https://www.hardwareluxx.de/index.php/artikel/hardware/gehaeuse/46827-be-quiet-dark-base-pro-900-rev-2-im-test-das-flaggschiff-gehaeuse-wird-noch-besser.html
Hello,
I can't answer your question directly, but it might help you...
You can find detailed information about this tower on the be quiet homepage, which may already help you. You can also ask be quiet directly. I've dealt with them about the Dark Rock and RAM space and the support is just great.
PS: Good choice of case...! The commissioning took us a lot of time (due to the modulation capability), but the thing looks great afterwards and leaves nothing to be desired.