This system use a proprietary form factor and connector for the power supply -- you're not going to find a PS that will fit inside the system. If you're willing to leave the power supply outside the case, you may be able to use an adapter from the link below and a standard ATX power supply/connector.   [URL]
I am wondering if i can upgrade my. Power supply to a 500w on my dell g5 5000 and if i can where do i get it.
Power Supply