Correct. From my analysis, that combination of stripe size and cluster size is optimal at this speed.
In FASTBuild, the drives automatically default to mode U. The "Performance" option only shows up when you are doing the auto setup mode. It is basically just a tag saying you want to do striping instead of the other option, "Security" which is setup for mirroring. I have gone through and manually setup my RAID 0 array so that I can control stripe size.
Write caching in Device Manager was grayed out so I could not change it, however it was set on "optimize for performance."
I navigated to the subkeys you mentioned but I could not add those lines in, as there were already DWORDs with those names. So I simply changed the dword value from a 0 to a 1, restarted (there was no save option) and ran a test again. It seemed to slightly degrade performance, but only on the order of a few MB/s. I changed these back to zeros and took a look at the PAM utility.
I too was looking through the users manual found online, but I noticed that a lot of things in that manual are not shown in the program. We have the latest version 4.something, so I assumed the manual was for an earlier version. For example, there was no option for PCI utilization speed or even the option to create an array from the PAM utility as is mentioned in the manual. Any time I wanted to delete and recreate an array I had to reboot and go into FASTBuild.
Anyhow, I am going to try to roll back to a previous version of the PAM utility to see if these options are available. I'll get back to you about that, but in the meantime if you have more suggestions please keep them coming