Internal Power

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How do I find out my computers internal power supply?

I am looking to upgrade my computer most importantly the graphics card but I was told that some of the best cards require internal power supplies in the 400-450W range nowadays. A 250-300W power supply won’t be able to handle it. How do I find out what my computer has? Look in a the manual etc.. THanks so much
Here is a general breakdown of my computer:
Gateway Yorktown 500x Pc
Intel Pentium 4 CPU 2.53GHz
510 MB RAM orig was 512MB 333 MHz DDR SDRAM
111 GB Storage

Anything else just let me know along with general upgrades opinions. This computer is from November 2002 so I know it’s time to upgrade. Lasted for awhile I think thank you.
NVIDIA GeForce4 Ti 4200

p4 require a minium of 350 to run. So your power supply is at least 350.

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