When the 22.214.171.1249 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 126.96.36.1999
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 188.8.131.529 RST GUI Help button Icon and found this below FYI: It is recommended to use RAID OROM 184.108.40.2067 with this driver
ASRock X99 Taichi | Intel i7-6800K | 4x4GB G.SKILL DDR4-2400 | Samsung SM961 128GB | ASUS GTX 1060 Turbo 6GB | EVGA SuperNOVA 750 G2 | LG 32MP58