I picked up the parts for my build today and discovered that while my MSI GAMING TRIO CLASSIC Radeon RX 7900 XT GPU has 3 8-pin connectors for power, my PSU (Gigabyte UD850GM 850 W 80+ Gold) only comes with two PCI-E power cables in the box, with two connectors daisy chained on each cable. Can I get away using both the PCI-E connectors from one of the cables when connecting to the GPU, or should I go back and get a PSU that comes with three separate PCI-E cables? Would I be creating any risk by trying to build and power on the machine with the current PSU?

For reference, here's the full build: PCPartPicker Part List

Edit: I'm seeing differing opinions but I'll probably try going back and getting a better power power supply. I figure better safe than sorry. Thanks for the advice all!