Aren’t you gonna need a new PS if you want to put that in an old box?
For the older machines that have entered the conversation.... Well it all depends...the newer mother boards have 24 pin power plugins...but older boards with 20 pin are available.
At the start of this article,...they choose a case that had a power supply included.
3rd page:
Case and Power Supply: Rosewill R424BK with 350-watt PSU ($29.99).