If he`s gonna use CF/SLI then he won`t be able to install something with PCI-E x4/x8/x16, as there are no 3 PCI-E x 16 slots with Gigabyte UD3/UD4 mobos.
And why Gigabyte GA-Z68XP-UD4?
He`s looking for: "Jeg har nogle krav til bundkortet, det skal støtte crossfire/sli og så skal det være ATX" + "Budgettet er på omtrent 700-1300dkk" ... so we shouldn`t recommend the hardware that we own ... only the hardware which will be perfect for # 0.
Other tip:
http://www.edbpriser.dk[...]
- but you have to check the extra features that you might use (f.e. front USB3 panel).
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My ultra silent PC:
P183 V3 + 1 back fan @ 350rpm, i7-2600K @ 3,5GHz @ 1.16v + NH-D14 @ 400rpm, C300 128GB, AX850, GTX 580 + Alpenföhn Peter @ 400rpm