I'm replacing my Nvidia Geforce GT 430 with a MSI Geforce GTX 970. My current card is just hooked to the motherboard. My new card needs an 8 and 6 pin. I only have a four pin available I believe from my 800 watt PSU but it is split from another 4 pin with a fan. Is this possible to split again into two more four pins for the 8 and 6.