Looking to upgrade power supply + GPU, questions

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Tiqii

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Mar 5, 2013
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Okay.
This is my computer;
http://us.gateway.com/gw/en/US/content/model/PT.GCCP2.003

If I were to buy this power supply;
http://www.ebay.com/itm/Rosewill-RD400-2-DB-400W-ATX-V2-2-Power-Supply-/180995544038?pt=PCA_UPS&hash=item2a242cd3e6

And this GPU;
http://www.ebay.com/itm/ATI-DIAMOND-AMD-Radeon-HD-6670-PCIE-2GB-GDDR3-Video-Graphics-Card-/110985433772?pt=PCC_Video_TV_Cards&hash=item19d73f52ac

Would I be able to install them both fine and would they work fine together on my computer?

Also, with that GPU how good of gaming am I looking at compared to the integrated graphics card I own now?