I have an Apevia X-Dreamer4 case(link will be below)
and it says on the case specs that it fits motherboards up to 11'' by 12'' but my As Rock z77 extreme4 motherboard is 12'' by 8.6'' will this motherboard fit in my case
Yups. Definitely it will fit in ur case, no problem. It is a ATX mid tower case. In this case u can fit any type of mobo like ATX, Micro ATX, ITX too. It's all ur choice my friend.
I hope it helps.
Yes, it will fit. The Case Specifies that it accepts ATX, Micro-ATX and Baby AT motherboards. Since that motherboard is an ATX board it will have hole spacings that match the ATX positions for the standoffs in the case. You might have to move a few of the standoffs but you will be able to make it fit.