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If you don't see all 4 GPUs, what do you see?
Do you see anything labeled "3d video controller" or "Standard VGA Device" under any of the other device manager sections? If so that's your problem... the driver did not install for some of the GPUs, hence the control panel doesn't offer quad-sli.
Uninstall and re-install the driver.
If you don't see anything else, then the system doesn't see the other card at all, which means something else is wrong..
heres my device manager..
(snip)