I'm currently running 2 92mm fans (front) and 1 120mm (rear), both Nexus, in an Antec Solo case. If I was to run all these at 7V would it cause any problems? I'm hoping to avoid frying my PSU (Seasonic X-650).

I'm planning on using 3x Nexus 3 Speed Fan Cables, which I'd have now if the company I'd ordered from hadn't sent 3 Zalman ZM-MC1 Multi Connectors by mistake. x)
edit: looking at the Nexus cable again it seems like it's got an inline resistor to supply 7V from the 12V line so I assume this would be OK.