Difference between SATA 3 and SATA 2 cables?

Recently purchased a HyperX SSD, and the listed specs is with a SATA III cable (6 GB/S)

I have SATA III Capability with my mobo, but I'm using a standard SATA II red cable.

Am I utilizing the 6 GB/S speed? Or is it down-shifted and hindered by the SATA 2 cable?

Thanks in advance!
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