how to connect 2x6 pin graphics card to psu

[zeta_r_123]

Mining rig question:

I am wondering how I should connect my Sapphire Radeon 7950 cards to the PSU. There are 2x6 pin connections on the top of each card.

If I use only one 6 pin connection at the PSU end that splits into 2x6 pin connectors at the card end, am I correct in thinking that this will only
provide each card with 75 Watts, rather than the 150 that it wants to get through the 2x6 pin connectors. That would put a tremendous load
on the motherboard (through the 24 pin connector).

So, do I need to use separate 6 pin connectors/cables for each of the 6 pins of the card?

Sorry for being so ignorant!