PC PSU is 350W
If this is your PC and that PSU can run like it should after so many years, a 7750 draws maybe 40 or 50 watts at its maximum, so it should work:
HP Pavilion Elite m9300t Product Specifications and Configurable Options | HP® Customer Support
Also, if you got the ASUS board, it has a BIOS update here:
HP Software and Driver Downloads for HP Printers, Laptops, Desktops and More | HP® Customer Support
Speccy or CPU-Z could show your motherboard.
Please post your PSU's 12 volt rail amperes, to be more certain.
How do I determine the 12V rail amps? With an amp meter or is there a software way of doing that?
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The PSU should have a sticker on it stating the needed value(s); a picture might help.
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