gtx-790

Hi all, I have an older MSI GTX-790 that I want to use in a PC I'm repurposing for use as a server. I think the card is a "gaming" edition since it has one PCI-E 6-pin and one 8-pin rather than the usual 6 + 6. However, the power supply in my spare chassis only has two 6-pin PCI-E plugs. Can I...