Isn't hyper its own key, not a combination of the other modifiers?
http://upload.wikimedia.org/wikipedia/commons/4/47/Space-cad...
Emacs seems to think so:
ELISP> (kbd "S-s-C-M-x")
[176160792]
ELISP> (kbd "s-C-M-x")
[142606360]
ELISP> (kbd "H-x")
[16777336]