I bought the agility 3 yesterday and made it my primary boot drive but it isn't using it's max read/write speed. It is suppose to go up to 525MBps (SATA 6Gb/s) read and 475MBps (SATA 6Gb/s) write. I did a little test on it and it only had a 167 mbps read and a 67 write speed. I don't get it as i have a 6.0 Gb/s motherboard and with a SATA III cable connected to it.
ASUS M5A87 Socket AM3+ 870 ATX AMD Motherboard
AMD Phenom II X4 Quad-Core Processor 955 Black Edition Boxed
OCZ Agility 3 60GB SATA 6Gb/s
8 Gigs Patriot memory
Galaxy GeForce GT 430
that's probably because you using incompressible data benchmarks like AS SSD or CrystalDiskMark which eliminate the Sandforce controllers ability to compress the data and speed up. Use the tools which were used to rate the max speeds. ATTO benchmark.
For that smaller drive.. it sounds about right though as the incompressible speeds go higher as the capacity goes up. 240's are fastest due to I/C configs.
you could also explore using raidxpert(yes, even on a single drive) to enable NCQ and write-back caching for best performance.