Should I connect the hdd in sata 3 or 4 or the ssd in the 3 or 4?

sata 3 slot
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8 port Non-RAID SATA III 6Gbps to B+M Key Adapter PCI-e 2 slot also have to have Sata support? or will it just worK? I can't

SATA 2 vs SATA 3 Nowadays, the mainstream hard drive interface is SATA But if your PC is very old, it may also offer SATA port

sata m2 slot Support SATA III 6Gbps Transfer Speed; Support SATA III SSD, HDD, Optical Drive*; Support PCIe , requires x4 Slot; Standard and Low Profile Bracket

sata 3 slot As a side note, at least on the 2005 Dual Core G5s, have a real SATA Gbs drive in the top slot & a SATA2 or 3 drive in the bottom slot