You need to set your older PC to AHCI. With older Core2Duo boards that means finding where it says NATIVE. Back then it was a big pain in the butt to config the BIOS properly. If I still had a Core2 system around I could walk you through it.
You might try the Marvell ports set to AHCI and give it a shot on one of those ports.
Also, update your Intel AHCI drivers.