EVGA GeForce GTX 980 Ti

My PSU had failed and I took an old one from different computer it is a Thermaltake TR2 RX 650W and I'm trying to use it in my computer. The only problem is that I have a GTX 980 that needs 2 6 pin PCIe connectors but I only have a 6+2 PCIe connector. My question is can I buy another 6+2 (or 6)...

Hello, When change the refresh rate from 60Hz to 120Hz it seems the text and some images start to blur. 60Hz 120Hz I'm not really sure of why it is doing this, any help is appreciated. Thanks