Hi guys this is my first custom pc and I have a corsair tx650 80+ psu my gpu which is the vapor-x r9 280x will hopefully be arriving tmr if not the next 3 days. This gpu requires 2x8 pin connectors and my psu has it but my questions are if I connect both will it perfom better than 1 connected instead of 2? Will 2 connectors increase the power consuption? Will it even power up if I only connect 1? Because im afraid that if I plug in both the wattage might be over my house circuit limit and blacksouts. Any help would be appreciated thanks!