Will a Sata II adapter work at SATA III speeds with a SATA III SSD? I have an Intel 520 180G SATA III SSD that I am looking to use with a SATA II Icy Dock Adapter. Will it cause a performance degrade to SATA II?
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No, your SATA III drive will work at SATA II speeds.
If you've never had a SSD before then you won't notice the difference anyway so don't worry about the performance degrade.
Everything always works at the slowest speed in the chain. In this instance, since you'll be connecting a SATA III SSD to a SATA II adapter, you'll be working at the SATA II transfer rates. You won't be getting all of the advantages a SATA III SSD has to offer, but it'll still be better than a mechanical drive.