SSD on Sata 1 can still make a difference, if the HDD is the bottleneck. Bootup time on my 4 year old desktop went down from 125 seconds to 21 secondsMy old hdd was running on Sata 2 and the new C300 is being detected only as a Sata 1 device. But the SSD still outclasses the HDD.
yes no doubt there will be a leap in performance it's just that for the money you pay you'd want to maximize its performance.

