Here's some breaking news (just today) from Cyberpower concerning their just released PFC UPS models which uses their new "adaptive sinewave" technology. I figure this will be of much interest for many of us that have been constantly going at it at the various UPS threads debating constantly over sine waves and buzzing noises (Macrumors forums at it's finest ) Here's the link to Cyberpower's article, which then links to the real article: http://www.cyberpowersystems.com/ab...rs-channel-pure-sinewave-ups-alternative.html Here's the link to the whole article by CDN: http://www.itbusiness.ca/it/client/en/cdn/News.asp?id=59349 Here is the link to the 1500va model on Cyberpower's site for those that are interested: http://www.cyberpowersystems.com/products/ups-systems/intelligent-lcd-ups/CP1500PFCLCD.html Here's an excerpt from the article: I'd like to think pricing has a lot to do with much of the debate that goes on concerning pure sinewave UPSes, even though it may not be spoken much. This article actually came at a funny time because I just shot an email to CP yesterday inquiring about the new PFC models and if these are meant to be the appropriate type of consumer UPSes for the Mac Pro and received this reply: Now of course, I understand that any company will want to sell you their product, so such email replies received by vendors should always be taken with a grain of salt. Also, I tried searching for any type of user or press reviews for these units and it seems these new PFC models are so new in fact, that they were just added to Amazon's inventory only just last month, and are still largely unavailable for sale. So it seems none of these are out yet in the wild. At least not long enough to see some user reviews. Here's another email reply from Jeff at CP regarding reviews: However, referencing page 6 of this thread: Uninterruptable Power Supply threads? by Ravich, in post #134, w00tini observed adamant promotion by Cyberpower in Newegg's AVRLCD user reviews to actively inform customers of their new PFC UPSes with adaptive sine wave technology for high end machines like the Mac Pro. Here is a direct link to Newegg's user reviews for the Cyberpower CP1500AVRLCD model, as pointed out by w00tini in the above mentioned thread: http://www.newegg.com/Product/Produ...yMark=False&IsFeedbackTab=true#scrollFullInfo You'll be able to see CP's active role in customer interaction here, mentioning their PFC lineup on several ocassions. Though I have been unsuccessful to find a proper white paper or get an adequate concrete answer from AppleCare on the Mac Pro's exact PSU specification, I believe a PFC PSU is part of the Energy Star 5.0 rating, according to Cyberpower at Newegg, and also based on more internet forum ramblings, which the Mac Pro is rated as. Take that as you will. If there is some common knowledge that is properly documented out there concerning the Mac Pro PSU confirming it to be a PFC, then please feel free to share any findings. So I just sent back my CP1500AVRLCD to Amazon due to a relapse in indecisiveness, but my interest is now piqued for new PFC these models. I'm personally hoping these will work as promised, provide less stress for the PSU while on battery, and finally get rid of that pesky buzzing sound. If anything, CP covers up to $425,000 compared to APC's $150,000 for their comparatively specced Back-UPS BR models. Like w00tini, I think I'll be ordering one and see how it works and try to report back as well. It's worth noting that this seems to be the very first consumer UPS product designed to work with PFC PSUs without the use of a pure sine wave. So I am curious as how fast and in what way will competitors react to these new products, assuming of course, this stuff actually works and isn't just more marketing baloney So I ask: any thoughts on this development?? Anyone think that this could be a big step in UPS technology?