Both the Premium and non Premium are based on the NForce 4 Ultra chipset, correct? If so, then both should be SATA II (3 Gb/s)
It's the NForce 4 non Ultra/non SLI that is 1.5 I believe. You'd have to be nuts to buy a motherboard based on the non Ultra/SLI.
It's the NForce 4 non Ultra/non SLI that is 1.5 I believe. You'd have to be nuts to buy a motherboard based on the non Ultra/SLI.