PSU and GPU upgrade

I have a HP Slimline s5220y that i want to upgrade to run counter strike source. I was looking at

http://www.newegg.com/Product/Product.aspx?Item=N82E16817103066&cm_re=flex_atx_power_supply-_-17-103-066-_-Product

for a power supply and this for my gpu http://www.newegg.com/Product/Product.aspx?Item=N82E16814261078&cm_re=gts_450-_-14-261-078-_-Product

just wanted to make sure the power supply would be enough i though it would be ok since it has 2 12v rails any opinions are welcome!
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More about upgrade
  1. I don't think 15A/300 watts is enough to run a GTS 450. Also the psu doesn't seem to have a PCIe 6-pin connector.
    http://www.atxpowersupplies.com/300-Watt-Flex-ATX-Power-Supply-Sparkle-SPI300F4BB.php

    Admittedly the Palit GTS 450 is really nice. It's the only two slot external exhaust low profile card I can find.
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