The SATA connection for the optical bay in the 2011 MBP may not be able to go at SATA3 speeds. You should be able to get SATA2, which will be around the mid-200MB/sec. vs. about 100MB/sec. tops for an HDD. A few people are able to get SATA3 speed in the 2011 MBP optical bay, some can get it if they use the Optibay Extreme, but I see that costs $99.