SATA port Question

So I'm about to buy this motherboard along with a 3200+ Venice and if I had 3 SATA drives and was overclocking passed 240MHz FSB then how would I connect the drives since only ports 3/4 are locked...is there some sort of SATA splitter that i can buy? or is it max possible 2 drives on 2 ports?

Thanks

SATA is 1 drive to a port. So I suppose an add-in pci card would work, assuming the PCI slots are locked. That is that board with pci lock that doesn't work on one SATA controller, right?