also..be aware that the new boards MIGHT have a 24Pin PSU connector, in comparison to the 'older" style 20Pin connector.
They are compatible (sort of)..but it all depends what connectors the pci-ex cards offer. It might have a pci-ex connextor (See adapter)...OR a molex...depends on the card. But having the pci-ex adapter (just in case) for sure cant hurt.
edit: the board you are looking at has the older style 20Pin...so get the adapter (in case it doesnt come with the card, which would be DUMB)...and with two free molex connectord in your case and this adapter you should be fine.