Question thinking of upgrading 9 year old pre built pc with a 750ti. would it be safe? do i need to buy a new power supply?

Eximo

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Do you have the micro tower or the small form factor? Finding a low profile 750 or 750ti might be a challenge.

I would be a little worried about the PSU age at this point, but given the CPU max is about 84W and the GPU should be under 75W, it is marginal. Don't plug your phone into to it to charge at the same time you game.