<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><br><div><div>On 16 Jan 2015, at 20:59, Dan Wilga <<a href="mailto:mythtv-users2@dwilga-linux1.amherst.edu">mythtv-users2@dwilga-linux1.amherst.edu</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div style="font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">On 1/16/15 2:14 PM, Henk D. Schoneveld wrote:<br><blockquote type="cite">On 16 Jan 2015, at 19:47, Henk D. Schoneveld <<a href="mailto:belcampo@zonnet.nl">belcampo@zonnet.nl</a>> wrote:<br><blockquote type="cite">On 16 Jan 2015, at 19:03, Jan Ceuleers <<a href="mailto:jan.ceuleers@gmail.com">jan.ceuleers@gmail.com</a>> wrote:<br><br><blockquote type="cite">On 16/01/15 11:36, Henk D. Schoneveld wrote:<br><blockquote type="cite">I would suggest check power-consumption first with a Kill-Watt device,<br>most PSUs are way to big and are most efficient when loaded at > 75% of<br>max capacity. HD’s don’t use that much power.<br></blockquote>Power supplies need to be dimensioned not for average load but peak<br>load. Which occurs at boot when the disks all spin up at more or less<br>the same time.<br><br>So unless you have a fancy controller that spins the disks up one by one<br>you need a lot of headroom on top of the system's average load after boot.<br></blockquote>You can watch what booting needs, you’ll probably surprised how low it is. Of course you can also encode multithreaded and see how high it goes.<br></blockquote>MAX TDP of X4 B50 =95W<br>Under max. load with 5 - 8 drives it will < 150W<br></blockquote>I agree. Much of the specs of power supplies has to do with marketing to gamers and folks who automatically assume that a higher-rated power supply is better.<br><br>In fact, when two power supplies are rated with one of the "80-Plus" variants, it's actually possible for a PS with a higher wattage rating to consume more than another with a lower rating.<br><br>That's because the 80-Plus certification applies to a 20% draw, on the low end. So if your system is only drawing 120W with an 800W supply, that's 15% and could be less than 80% efficient. A 500W would be 24%, so it's supposed to be at least 80% efficient.<br><br>I'm currently spinning 8 drives with an ION motherboard. The usual draw at the wall is about 130W. A power supply 650W or greater would go under the 20% threshold. (I'm using a 500W, IIRC).<br></div></blockquote>If your max draw, encoding multi-core, say your draw then is 200W, then a 200/.80 = 250W PSU would be optimal.<br><blockquote type="cite"><div style="font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">_______________________________________________<br>mythtv-users mailing list<br><a href="mailto:mythtv-users@mythtv.org">mythtv-users@mythtv.org</a><br><a href="http://lists.mythtv.org/mailman/listinfo/mythtv-users">http://lists.mythtv.org/mailman/listinfo/mythtv-users</a><br><a href="http://wiki.mythtv.org/Mailing_List_etiquette">http://wiki.mythtv.org/Mailing_List_etiquette</a><br>MythTV Forums:<span class="Apple-converted-space"> </span><a href="https://forum.mythtv.org/">https://forum.mythtv.org</a></div></blockquote></div><br></body></html>