When the 18.104.22.1689 RST driver first came out they indicated that TRIM was not enabled with this driver but will be enabled in the next 11.5.x driver.
The next 11.5.x driver was just released and it is driver version 22.214.171.1249
Alot of people are wondering if this driver in fact does pass the TRIM command while using a RAID 0 array as noted in the previous release.
Well It does !, But it seems its only for Windows 8 since this driver makes the device a SCSI device and Win7 can not pass the TRIM command with a SCSI device but Win8 can.
I was looking inside the 126.96.36.1999 RST GUI Help button Icon and found this below FYI: It is recommended to use RAID OROM 188.8.131.527 with this driver
GA-Z97X-UD3H | Intel i5-4690 | 4x4GB Samsung DDR3-1600 | Samsung 950 Pro 256GB | ASUS GTX 1060 Turbo 6GB | Cooler Master V650 | HP Pavilion 27xi | Creative Gigaworks T40 Series II