Ideally you consult your motherboard specifications, this will be the quickest and easiest a.
A tool to help you
Determine your motherboard model details is CPU-Z.
The good people over cpuid.com also have:
PC-Wizard which can report on the speed of the SATA ports.
After installing it myself it seems to only report on ports that are currently connected with a drive, and also only reports what that drive is capable on that port.
Example I have an older drive connected on a SATA III port, but it reports it as SATA I as that's all that drive can handle.
I don't know if there is one, never ran across one. Some older motherboards that first came out that supported S1 had issues with S2 when it came out, some hard drive manufacturers put jumpers on their S2 hard drives to set it back to S1 for compatibility. Next generation motherboards that came out did not have this issue. So unless you have a first generation S1 motherboard there should be no issues with S2 or S3. If you do find a utility please post it. – Moab – 2010-07-25T14:24:19.940
I am particularly interested in this to know if I should bother buying the Crucial RealSSD C300. They claim if you connect it to SATA II, you will see continuous read speeds of 265MB/sec. However, if you connect it to SATA III, you will see continuous read speeds of 355MB/sec. I have a laptop that is only five months old, but I have no idea which SATA versions it supports. – James Watt – 2010-07-25T16:57:16.713
After much research, it turns out my motherboard is not SATA III compatible. Regardless, I still want to know if there is a utility available for this! – James Watt – 2010-07-27T23:52:23.780