Hello Mnye, according to the information provided at downloadcenter.intel.com, the Intel® Solid-State Drive Toolbox (Intel® SSD Toolbox) 11.0 or greater states that Trim on RAID 0 is not supported on Windows 8* or Windows Server 2012 https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=18455
Bear in mind that Intel® SSD Toolbox was designed to be used with Intel® SSD products only, other manufacturers usually have their own software tools.
Additional information about Trim could be found at this link. http://www.anandtech.com/show/6161/intel-brings-trim-to-raid0-ssd-arrays-on-7series-motherboards-we-test-it
Something very important is that the C204 is a Server chipset so; the software that will recognize all of the features is Intel RSTe, since it was designed to work on this type of chipsets.
I suggest you contacting Supermicro for more information about this.