Hi SkOrPn, wow that's a lot of posts required to be able to PM.
The file was just the OROM, no BIOS. It's still version 11.6 but I do not think that should matter even if your using a 12.x driver as you can only use legacy. The newer UEFI RAID drivers incorporate an extra ACPI performance table so may have more of an effect than legacy OROMs plus the UEFI drivers can be problematic with pre 11.5 OS drivers.
Yes, 11.2 "Driver" has been best for me so far although I have not run the latest to compare.
SWFM
Soft
Ware
Feature
Mask are BIOS settings for RAID usually hidden from the user for some reason that enable or disable different RAID types, SRT, Banner etc...
There are some trim testing methods noted in the thread.
Sorry Makaveli, I was just trying to update the thread in case anyone was wondering, not trying to push you into testing if that's how it came across. Not sure why there are problems with the OROM size as there is another module bigger than that in the firmware but I guess the results will most likely be the same in that case so might be better to give it a miss.
Edit: 8-Jul
Just a quick update for you SkOrPn, I finally got hold of a Gigabyte EP45-UD3R with an ICH10R Southbridge plus C2D CPU and can confirm using W7/8 that trim works with the OROM that I had earlier linked for you and others. Not sure if having a core CPU makes a difference but I'm not going to worry about that for now.
Might work for earlier chips as well such as ICH9R but I'm happy enough finally getting confirmation on a pre-PCH chipset after so many months wondering.
I guess as we move further back with older HW it becomes harder, with some BIOS not able to hold the larger OROM or not load it correctly at run time so not sure if this is very useful or not.