The dirty little secret of flash drives today is that many of them are running on yesterday's interfaces. While SATA and SAS have undergone several iterations since they were first introduced, they are still based on decades-old concepts and were initially designed with rotating disks in mind. These legacy protocols are bottlenecking the potential speeds possible from today's SSDs.
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips