The link provided in the previous answer from "mashine" actually states that the current drivers does not support Windows 8 ... yet. You may try to look around for a Beta or RC.
For instance the drivers for Rapid Storage Technology has not been updated yet on Intels download pages - however 3rd parties like Gigbabyte has the RST drivers available for Windows 8.
However, different with SDD - delivered directly by Intel.
Try to look around and post if you find any. Windows 8 has built in support for Trim.