That's disabling swap, not overcommit. Windows doesn't overcommit. It's one of the reason why it handles low memory situations so much more gracefully than Linux.

^

    The purpose of the system commit limit and commit charge is to track all uses of these resources to ensure they are never overcommitted — that is, that there is never more virtual address space defined than there is space to store its contents, either in RAM or in backing store (on disk).