The primary (HDD) SATA port is SATA3 (6Gbps ~ 700 MB/sec ish) while the secondary (optical drive's) port is SATA2 (3Gbps ~ 350MB/sec ish) so you definitely want to put any SSD in the primary SATA port where the main HDD is/was. replacing the DVD drive with a second disk) bear in mind that the two SATA ports are of different speeds in the mid-2010 MBP. For power users with high-performance demands, you won’t go wrong with OWC 1.0 TB Aura SSD. One final point, if using a data-doubler or similar (i.e. For general users who want an affordable yet high-capacity SSD, Transcend JetDrive 820 is surely a winner in the market. And unless you're doing some heavy video editing or really disk-heavy work, I'd suggest the performance differences won't be noticed. Sure it was nice having ~400MB/s+ (not sure what speed it actually ran at) but I didn't do a lot of work that truly utilised the top-speed of the SSD, so the performance differences were pretty moot. For me, the top-end drive speed difference didn't mean all that much, because primarily I was after the low seek speeds. I also found some vendors saying that (at the time) the Intel 330s were seeing less RAs than some other similarly priced brands I was looking at this may or may not be the case right now, and I was only able to compare a few brands.

I found people saying they'd successfully used the Intels (and well most brands actually). Personally I looked around for info on the most reliable SSDs rather than the fastest. It worked for me, and it's TRIM compatible but you need to use TRIM Enabler or similar to turn it on. The performance difference (compared to stock 500GB HDD) was amazing. I put an Intel 330 series SSD in my mid-2010 MBP.

Best ssd for macbook pro 2010