when you are using risers - those cheap ones are VERY fickle ... unless using pcie x16 risers - you will NOT get the full power of the 'on board power' which is supplied by the motherboard ...
#crysx
I alter the bios to only use pci-e 1x and save some power. Most of my riser cables are cheap, but I have some expensive cables as well. When using less money on the boards and the risers, I have more money for the cards
