I understand from other posts that Intel now has a version of their motherboard RAID drivers that supports TRIM, but I don't personally use it so I'm afraid I don't really have any more info for you...
Ive heard conflicting information. It seems the Intel drivers do not support TRIM when the SSDs are in RAID0 array; only if they are single drives with the SATA mode set to RAID; so the SSDs themselves may not be part of a RAID-array; or TRIM won't work.
If that is true, then you need to create smaller partitions on your SSDs if you intend to use them without TRIM. If you don't do this, it'll slow down over time and the RAID won't correct for that.
The gist of it is that the new driver will pass TRIM commands to an SSD, but only if it's not configured as a member of a RAID volume.
The idea is that you can configure the motherboard BIOS to use "RAID" mode, set up a single SSD to hold the OS and a set of hard drives as a RAID volume to hold data. In this scenario, the SSD will benefit from the TRIM commands. But if the SSD is itself part of a multi-drive RAID volume then it won't.
NOTE - in my mind there's still a question about how Windows decides whether to use TRIM or not. If Windows configures itself to use TRIM based on what it detects at installation time, then just installing the new drivers may not help. But if it detects TRIM capability at boot time then a simple reboot is all that would be needed to get those TRIM commands flowing.