Thank you for this, I have clearly misunderstood the rated speeds of the drives.
Now I feel silly for having thought the 6Gb/s stated in the product title on Microcenter as an indication of the speed (and for having not thought twice about it). It does say in the product details: “[…] data transfer speeds of up to 210 MB/s”. I guess they were simply saying that 6Gb/s is what the SATAIII interface is capable of? 6Gb/s is in the listed product title on amazon/micro center, and I was obviously duped by this.
I feel a little silly having believed it without really questioning it.