Two things first:
1) Download/install/run AS SSD. - DO NOT need to run the benchmark. Just look at the upper left. It will show what driver is being used:
.. pcide = Bad That says it all.
.. msahch That is OK
.. iaSTor that the best configuration.
2) look at the drive using my Disk manager - there should be two partitions, one a small 100 mb system partition and then the larger one should be "C" drive.
3) Hate to be the bear of bad news, But it does not matter if your SATA III Agility III is on sata II or SATA III - It will not run any faster on SATA III. Yes ATTO Benchmark will show higher on SATA III, BUT if you run AS SSD you will find it score the same for SATA II or SATA III - Yes this is in a review PLUS I verified on My system, Have two 128 gig Agility III.
Here is where it gets tricky.
1) How did you install windows on the SSD???? Did you do the recommended method of first disconnecting your HDDs BEFORE installing windows 7 on SSD. If NO then highly recommend that you re-install win 7 on the SSD.
2) While it is recommended that the Bios be set to AHCI, with an Intel chipset the Bios May be set to Raid. Here is a 2nd stick point, if you reinstall windows with the Bios set to AHCI you may not see the HDD after reloading windows. Simple solution is to back up the HDD just to be safe.
3) If you leave the Bios set to raid that is OK,
.. First visit Intels download and download the "F6 Driver. Put on a thumbdrive.
.. Just that you will need to Select custom install
.. Play it safe select advanced and delete any and all partitons
.. On page that displays the SSD (DON't FORGET need to disconnect HDD first) there is a check box for Additional drivers.
.. After checking the box and selecting where to install. you will be prompted for the additional driver, just broose to the thumbdrive and select the driver.
.. Then just continue as normal for reinstall.
If the Orginal installation was done with the HDD disconnected and Bios was set to IDE, you might be able to just force it to AHCI. Requires editting the Registry, reboot to Bios and setting the Bios to AHCI. (just google changing ide to ahci in windows 7 NOT this is a faily common problem. Then just un-install RST and reinstall, that should then convert the msahci driver to iaSTor.
Added:
You said "So AHCI is better than RAID for my SSD?"
Short answer NO they are the same if properly set up.
Long winded explaination. AHCI setting will set msahci as driver which can then be changed to iaSTor. When Bios is set to raid, and the SSD is NOT a member drive, iaSTOR can still be used and the drive will be treated as a AHCI drive.