Hmmm. Every motherboard I've ever owned used a 2x5 with one shared ground and a "missing" ground pin acting as a key. Maybe I'm not buying cheap enough motherboards? Fortunately, I haven't fried my Deneb yet. ;-) My two A1200 motherboards have not been so lucky, although one arrived broken from the dealer, who shall remain nameless even though they ignored my requests for support.
