jonnytoogle :
I’m new to PCs and was wondering if the GPU (galax rtx 2070 ex 8gb) was compatible with my psu(Corsair cx650m) please help me out
Yes they are compatible. According to the mfg.'s page
here it needs a 6-pin and and an 8-pin PCI-E power connectors and a minimum of 550W PSU.
Your PSU is 650W and has four 6+2 PCI-E connectors.