When the 188.8.131.529 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 184.108.40.2069
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 220.127.116.119 RST GUI Help button Icon and found this below FYI: It is recommended to use RAID OROM 18.104.22.1687 with this driver
GA-Z97X-UD3H | Intel i5-4690 | 4x4GB Samsung DDR3-1600 | Samsung 850 Pro 256GB | XFX Radeon R9 280 | Cooler Master V650 | HP Pavilion 27xi