The key functioned by validating the software installation with a remote server, unlocking the code that allowed the user to input a custom size beyond the 4GB trial limit. For power users who had 32GB or 64GB of system RAM and wanted to dedicate half of it to a scratch disk, purchasing the key was a necessary investment to bypass the artificial software restriction.

AMD quietly buried RAMDisk in favor of (which tiers SSDs+HDDs) and Radeon RAMCache (which uses RAM as a cache, not a separate drive). Neither requires a license key. Radeon RAMCache is inferior to a pure RAMDisk but easier to use.