A little information
The latest, fastest, glass plattered spinning magnetic Drives .... at 7200RPM .... max out at about 125Mb/s ... and that's on the very outer edge of the platters .... SataII ... SataIII ... or SataIIIIIIIIIIIIIIIIIIIIII will make no difference to the drives maximum output ... the speed improvements can only be utilized with SSD ..... the more you pay .... the more you get.
The OCZ Agility 3 SSD has a theoretical (about) 500Mb/s read/write and this is achievable on the board you have if configured properly .... try putting it on , and it alone on the ICH10 controller and see how thing go .... if you can get it to 450ish read/write .... that's what should be achievable from users posting around the traps
Aussie Allan