Andrew Ku at Tom’s Hardware published a little gem of an article that discusses SSD performance relative to HDD performance in a very interesting and very sane way. Ku writes: “As a point of comparison, a file operation completes 85% faster on a low-end SSD than it does on a high-end hard drive, but there is only an 88% speed difference between a high-end hard drive and a high-end SSD. That why you shouldn’t let less aggressive benchmark results at the low-end deter you from making the switch. You don’t have to have the best SSD to get great performance relative to a hard drive.”
Ku’s article then places 39 SSDs in a 10-tier hierarchy to help you sort out the fastest performers (Tier 1) from the slowest (Tier 10). Just remember, even Tier 10 SSDs are really fast compared to HDDs.
You can read Ku’s full article here.