My new Gigabyte GTX 770 requires two 8-pin power connectors. I saw somewhere that it is recommended to use two separate cables opposed to using one cable that splits into two 6+2 connectors. Someone said it is better to NOT use one cable that splits into two 6+2 connectors and to use two completely separate cables drawn from the power supply instead. What is the reasoning for this? Is this true? Am I really hurting anything if I use one cable that splits into two 8-pin connectors?