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).
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).