^ Do NOT up your pci-e bus (Aprox 100 MHz) above 103 as instabilities are common. His problem is the MARVEL control and the Agillity III. Nothing wrong with the Agillity III - Read my comment on it.
It is a Combination of the SSD and the MB marvel controller.
In General Sata III SSDs perform Best on an Intel sata III Port using iaSTor as the driver.
That is why you will see most reviews based on that plateform. ATTO is used by manuf BECAUSE it gives the Highest Sequencial performance - So they can brag, Never mind that (A) For an OS + Program drive SEQUENCIAL performance is the LEAST important parameter and (B) it used highly compressable data which is NOT representative of OS +program drive usage.
First on the Agility III SSDs (and yes I have 2 128 Gig Agility III).
.. The Agillity III performs NO better on a Intel SATA III port than it does on a Intel SATA II port. This was documented in a review which I confirmed on on my system a i5-2500k Asrock Extreme 4 (It's overall score using AS SSD is mid 400's - A M4 and the Samsung 830 both get an overall score of over 700)
.. Based on this I would always run an Agillity III on the Sata II port and NOT on a older Marvel SATA III port.
.. Even on a Intel sata II port it is WAY faster than a HDD.
On Benchmarks.
.. ATTO is great for HDDs that have Both OS + Programs + USER FILES. Large files structures can take advantage of High sequencial performance. HOWEVER these large files structures will NEVER be found on small SSDs. It is NOT representative of what a User will see in day-to-day performance using a SSD as a OS + Program drive.
.. The best Benchmark to look at in reviews is PCMark vantage, both overall and score for applications that you most often use. Unfortunatly not a easily optained Benchmark program.
.. My preference for Home Benchmark is AS SSD. It uses Compressed data, while still not perfect, it does come closer to "real-Life day-to-day" performance.
Bottom Line - Move it over to the Intel Sata II port (forget the Hype), Install the Intel AHCI driver (iaSTor). and if You get in the Mid 400's (based on AS SSD) your are getting the most it can deliever.
SSDs do NOT like to have Benchmarks repeatably run - there performance will suffer, Must let trim and CG restore the drive.
If you follow my recommendation - Move it to the Intel SATA II port, I also recommend (a) Do a secure erease, B0 verify latest Firmware (I believe ir's 2.15), then re-install windows 7.
PS I have 2 128 gig agility IIIs, 2 Curcial M4s and 1 128 gig Samsung 830 + Older version SSDs: Intel G1, and G2, a Phoenix pro, an Torqx and a WD Blue SSD