While the odds are that it will work, two issues.
First, 1st generation SATA controllers often have problem communicating with SATA III devices. Technically, SATA III is backwards compatible. In practice, there are problems.
Second, driving an SSD through a 1.5 Gb/sec link will rob it of its speed. The access times will still be fantastic, but you will be running a 400 MB/Sec device through a 150 MB/sec pipe.
It's not something that I would count on to show a benefit.