1060's have a low TDP. With a power limit set <80%, generally <100W including the risers. You should be fine running two cards per VGA port on the PSU cables that have a dual 8-pin. On the 3rd PSU VGA port you can run the 5th card with the riser using a dual splitter cable and on the 4th PSU VGA port, you can run two risers with a dual splitter cable. For the last two risers run one riser per molex/sata cable on the PSU.