Hi all, I have ordered a Sapphire Nitro R9 Fury to replace my 2 7950`s. At the time of ordering, I didn't realize that the R9 has 2x 8 pin connections. My PSU is 1000watt OCZ but only has 4x 6 pin connections. Would a 6 to 8 pin converter cable be ok to use or do I have to buy a new PSU?. My PSU...