If it shows one primary and three linked adapters, then it is working as it should, but as games vary in their multiple GPU performance from 0 to near 100%, and never scale linearly to 400%, the amount of performance increase in games will vary.
Not home atm so I can't check, but I don't think it shows up like you say.
Additional problem since yesterday: one card keeps disconnecting, resulting in system freeze. Happens independed of graphical load at that moment. Have to hard-reboot and most of the time the systems sees only one card after the reboot. After fiddling around a bit with the pcie power connectors and some reboots, the system sees both cards again, only to lose the same one again after random time (going from 5 minuter after booting, to 2 hours after boot).
Swapping the cards with each other gives same result with the same card... :-\