MediocreFred Posted July 24, 2009 Share Posted July 24, 2009 Hello, How long will the rated voltage be present on the output of the 400CX after the input power has been cut? I looked through the manual as well as the corsair web site, but, couldn't find this information. Also, I read that the 400CX has a newer revision that replaced a capacitor to bump up the hold up time. So, what was the hold up time originally? what is the hold up time in the new revision? And, since I am about to purchase one now, how do I identify the new revision? Thanks, MediocreFred. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted July 24, 2009 Corsair Employees Share Posted July 24, 2009 PSU isn't a UPS, the cap may hold up the voltage for very short time but it is going to be a fraction of a second or even less depending how how quick your hardward drains it. Link to comment Share on other sites More sharing options...
MediocreFred Posted July 25, 2009 Author Share Posted July 25, 2009 Ram Guy, My question was along the lines of this thread: http://forum.corsair.com/forums/showthread.php?p=326893. I have an APC UPS that does not generate pure sine wave output when on battery. My PC has an Antec EarthWatts PSU that shuts off the instant a power failure occurs. My research online as well as talking to Antec Support has yielded the fact that Antec EarthWatts PSUs have a very low Hold Up Time and so need a pure sine wave output. I've also read that Corsair PSUs have a much higher Hold Up Time (in the 16ms range) and so work fine with APC UPS devices. However, all of these user reports were for the HX series of PSUs. I am interested in the 400CX PSU for 2 of my PCs (the one that has the Antec and a brand new one that I am assembling) and would like to make sure that its Hold Up Time is in the 16ms range. A follow up question was regarding the revised version of the 400CX (with a purple capacitor instead of a black capacitor) and its increased Hold Up Time. How do I identify it? Thanks, MediocreFred. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted July 28, 2009 Corsair Employees Share Posted July 28, 2009 400CX should be 17ms as well but again it depends on how fast your hardware drains it as well. Link to comment Share on other sites More sharing options...
MediocreFred Posted July 29, 2009 Author Share Posted July 29, 2009 Thanks for the clarification Ram_Guy. I have ordered a 400CX and should be receiving it in a day or two. One unanswered question from my posts in this thread remain. How do I tell if the 400CX I receive is the newer revision with enhanced hold time (purple capacitor)? See this thread. Is there a revision number printed on the PSU? Is the purple/black capacitor visible through the PSU vents? Can I tell be the serial number? Thanks. Link to comment Share on other sites More sharing options...
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