Will I need to upgrade my PSU along with my graphics card?

Hello, I'm new to tinkering around with PCs and just recently I got my hand on an HP prebuilt PC and I want to try and upgrade the graphics card as soon as possible, I haven't opened the tower for the sake warranty but I'll get to it eventually, however I went to the manufacture's website and here are some of the specs they claim this PC has:

-Intel Core i7-4770
-8 GB DDR3 (1 x 8 GB)
-SATA 1 TB 7200 rpm
-DVD SATA drive
-AMD Radeon R7 240 2 GB DDR3 Graphics Card
-300 W PSU.

So, I was thinking of upgrading my graphics card to a GTX 750ti because it's in my price range, but will I need a new PSU along with it? I went to Nvidia's website and it says the minimum system power requirement is 300W and the graphics card power is 60W, am I clear to freely replace my current graphics card with the GTX 750Ti without upgrading the power suply? If so, what PSU should I get?
Thanks in advance!
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More about upgrade psu graphics card
  1. Best answer
    You shouldn't need to upgrade for a 750ti.

    If you want to upgrade in the future here's a nice.

    PCPartPicker part list / Price breakdown by merchant

    Power Supply: XFX TS 550W 80+ Bronze Certified ATX Power Supply ($59.99 @ Newegg)
    Total: $59.99
    Prices include shipping, taxes, and discounts when available
    Generated by PCPartPicker 2014-07-26 15:32 EDT-0400
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