Is my psu good enough?

My desktop is a factory standard HP m9451uk (link to specs below).
I have just bought a Geforce GTX550ti graphics card to upgrade it a bit. The current power supply is 300W but the card says to use a minimum 400W supply.
I'm not planning on running multiple monitors and my max resolution is 1600x1200, I do intend to play games like Crysis 1,2&3, Skyrim and Napoleon Total War on high graphic settings (if not highest where possible). Do you think my 300W PSU cope? If I try and it can't cope, could it damage other components?

Thanks
Rob

Specs here:
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c01581223&lang=en&cc=us&contentType=SupportFAQ&prodSeriesId=3794173&prodTypeId=12454
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More about good enough
  1. With OEM PCs like that one you're generally given what you need to run whats in the PC. I wouldn't trust that PSU with the addition of a 550ti. You might want to look at getting a decent 400w or better PSU.
  2. Thanks, I thought that would be the case. Can anyone recommend anything?
  3. Thanks, I thought that would be the case. Can anyone recommend anything?
  4. Corsair, Seasonic, PC Power and Cooling - all great brands. For the GTX 550ti 400 watts would be, however, if you buy a quality PSU you may choose a better more powerful PSU (600 Watt) for future use in this or your next rig.

    Good Luck !!
  5. Thanks guys. Getting a Corsair CX430.
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