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ATX12V vs "Internal ATX"?

I'm looking to upgrade the PSU in my current pre-built Computer.

http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&dlc=en&docname=c02995511&lc=en&product=5157024#N1222 - Here is my Computer with all specs included.

If you look under "Power Supply" it says this:

Form factor: Internal ATX
Total wattage: 300W
Nominal input voltage range:
100-127V/8A (50-60Hz)
200-240V/4A (50-60Hz)
Dimensions: 150mm x 140mm x 86mm (5.9 x 5.5 x 3.4 inches)

The thing concerning me about upgrading is the "Form Factor" which says "Internal ATX".
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151093 - Here is the PSU I want to get, it is listed as "ATX12V"

Will this PSU work with my computer? I have no idea what Internal ATX or ATX12V means, let alone what ATX even means :(.

Thank you for reading!
3 answers Last reply Best Answer
More about atx12v internal
  1. Best answer
    Yes, your PC uses a std ATX power supply. The new one will be about an inch longer (stick into the case further) than the old one. If there is no obstruction with that extra inch, you will be fine.
  2. Best answer selected by Sladeakakevin.
  3. Thank you!
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