550W psu power a evga sc acx 2.0

Ultra has an extremely poor reputation for PSU quality. Although 550W is enough, I would not count on your your "LSP" to be good for more than ~400W before wandering out of spec. Find a replacement made by Seasonic (their own, XFX, some Antec), Super Flower (Rosewill Capstone, Kingwin Lazer, EVGA B2 or G2) or Delta (some Antec).
 

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Dec 28, 2014
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so you would say that it would be better to get another power supply then to use this, becasue i have money to buy another psu and this is a really good deal right now should i buy it http://www.canadacomputers.com/product_info.php?cPath=33_1238_443&item_id=072006