You should have no problem putting in 2070S in your G5 5000 with 500w psu. Recommended psu is 412W for 10700f + 32gb ram + 2070S + 2xssd based on basic psu calculator. for ram upgrade choose crucial ram guaranteed to work for G5. it is better getting matched rams from crucial than another 16Gb ram that does not match your stock Dell 16Gb ram.  Or you can buy another Dell ram that matches your current one exactly.
i want to put in a 2070 super my pc specs are i7-10700F my power supply is 500 watts and i have one stick 16 gb of ram my graphics card right now is a 1660Ti also i want to get more ram and was also wondering which ones i should get 
i want to know if i can put in a better gpu in my dell G5 tower