Got nothing against Tigerdirect, but Ultra is indeed pretty crap. You might not think it, since their X3 and X4 units were reviewed so well, but their X2 and LS and LSP series units are almost universally crap. And they make lots of behind the scenes changes; the LSP650 could be one of four units from as many manufacturers (Andyson, Wintech, Yue-Lin, RSY), all of them sucking in different ways. Some variants can't do their rated wattage and explode, others have horribly out of spec ripple, others are just moderately overrated and inefficient. All of them have terrible to mediocre build quality.
Here's a competent
review of the 750W Wintech version:
Most reviews you see of Ultra products are people who either don't understand PSUs, or are shills. In fact, that's a general rule for PSU reviews, there are only maybe a dozen people who have the equipment to properly review power supplies, and another couple dozen who can do a proper component level analysis.
Yes, you need to replace it.