Thinking about setting up a dual PSU system but am wondering about the need to tie the grounds together between the power supplies. The load will be split between two units.. i.e there will be a PSU powering the motherboard which powers a graphics card, while another PSU maybe powering the PCI-e Power on the same card. I was wondering if to tie the ground would be as simple as running maybe two negative connections between the negative on a set of molex between the two units? And if i had 3 power supplies, would i need to daisy chain this? Could a solution for this problem be running one of these adapters http://www.performance-pcs.com/catalog/images/products/Dual-PSU-Cable_01.jpg because it seems it connect a COM (ground) from the master PSU to the slave, is this enough to create a common ground? Thanks.