I was getting ready to purchase APC® Back-UPS® ES 550 Battery Backup, BE550G, 550VA/330 Watt UPS and then a read a review that says do your research because that person's computer didn't function correctly with the stepped simulated sinewave that the UPS uses. So I ask you guys, Will the APC® Back-UPS® ES 550 Battery Backup, BE550G, 550VA/330 Watt UPS work with my Corsair CS650M power supply. All I'm looking for is a cheap UPS that will give me 5 minutes to shut my computer down correctly if my power goes out.