I have an Asus p8B75-V motherboard and a coolermaster haf 912 case. My case says it needs 9 stand offs for an atx board while i only see 6 stand off holes for my motherboard. Is it fine if I install the motherboard with the 9 standoffs or should i install it with only 6?
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You can get by with six standoffs used, but the board may flex more when installing connectors on the unsupported side.
It's the board design. The depth is not a standard ATX (21.9 vs 24.4 cm), therefore only 6 holes. Use only 6 standoffs. Any unused/extra standoff in contact with the board would create a shorting issue.