Well I did get a low profile card I made sure but what's proprietary? I'm new to computers.
Proprietary means "custom made for" and will not fit for others.
Well Ive been visiting websites that claim they have a psu for it but most I see are boxes opposed to my rectangular psu
Please put the link & we will help check. & it will also help if you can give the dimension of the PSU in your case. If you can not find it in the specifications, do actual measurement and post it here.