* eXtreme Power (500-650W) are from Seventeam. They are old Seventeam designs with low efficiency and not enough capacity on the 12V. Build quality is fairly low with cheap fans that die all the time. They are also overrated by Coolermaster, usually by ~100W. Avoid.
* eXtreme Power Plus (all wattages) and eXtreme Power 380/430W are low end AcBel Polytech units. They are generally overrated slightly and are unimpressive performers. Build quality isn't that great either. If you knock ~50W off their labeled capacity and treat them as such you could do worse, but I would still avoid them.
* Real Power Pro (450-750W) are fairly good AcBel units. Build quality and performance is decent, but uses a group regulated design and secondary caps aren't the best (Ltec). I don't find myself recommending them too often but they are good enough if the price is right.
* UCP (Ultimate Circuit Protect) are AcBel's flagship R88 design. Efficiency and build quality is good, performance is overall good but nothing stand-out. Once again, I don't find myself recommending them unless the price is right.
* Real Power Pro (360-460W and 850W+) are from Enhance. The low watt ones aren't anything special, but the higher watt models are quite nice. Efficiency isn't the best compared to some newer models, but performance is still top notch and are very good buys.
* Silent Pro (500-700W) are budget Enhance units. Performance is fairly good, but the 12V rail is a little underpowered and it is a group regulated design. They are decent budget modular units, but performance doesn't quite stand up to most of the competition.
* Silent Pro (850W+) are from FSP. I don't think I've seen this design tested, but I've been told they are decent budget units. From what I have seen they aren't much cheaper than the usual recommendations so I don't see much of a reason to go for one, especially since it's from FSP. Considering FSP's past designs (Epsilon) I would like to see how these perform before I decide either way about them.
Its safe, the same has been confirmed by a Corsair rep himself (Cant find the link though). Though if you want to eliminate that buzz get a Sinewave UPS from APC, as vip has pointed out.Arjun said:Is it safe to use corsair cx400 with luminous ups? I get a buzzing sound from the cx400 when the ups goes in backup mode.
Very informative thread. Thanks to tangentray :hap2: . Still, it does not provide any solution except buying expensive pure sine wave + Active PFC combination. For Passive PFC + impure sine wave , there is no solution but Gigabyte and CM eXtreme Series. CM extreme series is not recommended by http://www.techenclave.com/pc-buying-advice/the-power-supply-unit-recommendation-thread-155724.htmltangentray said:...SNIP...
All APC Smart UPS and high end models have pure sine wave, but the cost a lot. So you can opt for that if you want to( and are rich :hap2: ). For people who are already stuck with lower models of APC UPS(which also do not come cheap :no: ) there is the option of none PFC and passive PFC models. All el cheapo unreliable PSU-s are none PFC. Passive PFC is becoming rarer by the day but still avaiable the Cooler master Extreme Power series and the Gigabyte Superb power series fall into this category. Please add more if you know of.