I bought a Gigabyte GA-P35-DS3L ,ATX Form factor,& measures 305 x 210mm. I am looking for a case for this motherboard. I see a lot of cases with a ATX form factor. Now I want to be sure when I order one that it will fit this motherboard, so will a ATX form factor of a case fit all motherboards (is it universal fit) that have an ATX form factor. Does the dimensions of the motherboard matter? If anybody has any advice on this matter would be much apprieciated. Thanks for any help on this.