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# Windows 7: is Corsair VS450 good build for my pc

 22 Jul 2014 #11 ICIT2LOL Desk1 7 Home Prem / Desk2 10 Pro / Main lap Asus ROG 10 Pro 2 laptop Toshiba 7 Pro Asus P2520 7 & 10 18,998 posts Central West NSW Quote: Originally Posted by Layback Bear Mtp where did you find this piece of information. From post # 9 Quote: I would not go any bigger than 450 - especially as PSUs become much less efficient at low loads. MTP as my understanding of the machinations of PSU's is that they adapt the power draw from the mains in direct correlation to what the machine is using = say the machine is requiring 200 watts of DC power at idle then the power from the mains will be accordingly similar and that may be 220 watts of AC power (very rough example) when at high machine usage say 350 watts DC power is being required then the draw from the mains may well be 420watts of AC power. The efficiency is built into the PSU circuitry to sense the amount of power being used and adjust the power being drawn. Now that efficiency of any PSU is measured by the manufacturers as a percentage of the power converted from AC to DC. The figures quoted as 80% is then rated by colours meaning that a gold 80% rated device is better than a silver 80% PSU. See the efficiency levels in this link 80 Plus - Wikipedia, the free encyclopedia So in reality the PSU will always draw more watts (AC) than what (no pun) is being produced as watts (DC) power. That is simply because there is always some power loss in every component in any electronic device. To give you an idea say pass an electric current through a resistor the amount of power at the "outlet" end will be less than the input because the passage of the electrons causes heat to be produced by the mechanism of friction for want of a better analogy and therefore taking the laws of the conservation of energy the total energy in will not equal the energy put out. The same goes for all electronic components and a good example of this is of course the CPU! So wherever that information came from is wrong especially of the technology behind how those electronic components and devices are now made. Again and lastly for an example of the power being dissipated - a power transistor of this day and age compared to the old power output vacuum tubes of a few decades ago is light years apart. My System Specs
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 22 Jul 2014 #12 mtp Server 2012 R2, Windows 8.1 , W7 ultimate x64 97 posts switzerland Quote: Originally Posted by ICit2lol    Quote: Originally Posted by Layback Bear Mtp where did you find this piece of information. From post # 9 Quote: I would not go any bigger than 450 - especially as PSUs become much less efficient at low loads. MTP as my understanding of the machinations of PSU's is that they adapt the power draw from the mains in direct correlation to what the machine is using = say the machine is requiring 200 watts of DC power at idle then the power from the mains will be accordingly similar and that may be 220 watts of AC power (very rough example) when at high machine usage say 350 watts DC power is being required then the draw from the mains may well be 420watts of AC power. Using your numbers as an example. Your theoretical power supply is 200/220 = 91% efficient at a 200W draw and 350/420 = 83% efficient at a 350W draw. Yor computer, at idle will likely be less than 50W. If delivering 50W requires 65W then it is 77% efficient. All power supplies follow this basic curve less efficient at low and high power relative to max rated output and more efficient in the middle. I did a quick google for power supply efficency and found the found the following for a corsair psu: Below 50W - efficiency continues to drop steeply. When Hardware is Free, Power is Expensive Here is a chart from Anandtech that shows comparisons across different wattage psus. Mark My System Specs
 22 Jul 2014 #13 ICIT2LOL Desk1 7 Home Prem / Desk2 10 Pro / Main lap Asus ROG 10 Pro 2 laptop Toshiba 7 Pro Asus P2520 7 & 10 18,998 posts Central West NSW Yes Mark my figures were exactly that - plucked out the air as an example. I know one can get these sites up - but the bottom line and my point is that what goes in is not what comes out. As Layback Bear was probably thinking as I did what you were saying sounded like the size of the PSU doesn't matter and personally I like to have a fairly large margin of error when buying my PSU's and am not happy with anything less than 500 watt devices. The saving if there is any at all using a smaller device is really minimal and one runs the risk if one can put it tht way of over driving the small PSU. Better to have a tad overkill than not and fry the device. I did post that link to the calculator and it is very good as you can see by it recommending the size of the PSU as well as detailing the actual power usage of the system. But the choice is yours and now I am wondering why you asked the question in the first post?? if you have already stated what you are going to do. Again personally I would not use a VS even though it is Corsair I would use the CX models in preference. That is simply because the Corsairs like all other brands are not made by the same manufacturer, and thereby so does the quality go too - IMHO. See this PSU Makers: C-D - Who's Who In Power Supplies, 2013: Brands Vs. Manufacturers My System Specs
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 22 Jul 2014 #16 ICIT2LOL Desk1 7 Home Prem / Desk2 10 Pro / Main lap Asus ROG 10 Pro 2 laptop Toshiba 7 Pro Asus P2520 7 & 10 18,998 posts Central West NSW My apologies for the confusion with the OP and as with everything you will never get total agreement from everyone. My Ivy Bridge only has the HX 1050 because it was on offer otherwise I was going the HX 750. Plus I think it was essenbe pointed out once that modulars are good because they can be removed without disassembling the whole machine - something that had not even occurred to me. So it is modular for me in the future or even a semi mod would be better because there are only the essentials in situ. My System Specs
 22 Jul 2014 #17 Phill3990 Windows 7 Home Premium x64 365 posts United Kingdom I have a Corsair Builder Series CXM 600W Modular and have had no issues with it at all. I went with Corsair because they have a good reputation, it was easy to install and has zero noise, not even sure if it gets hot lol. Its possible 600W is too much for my rig, but its always better to have too much then not enough Knowing my luck if I had gone smaller it wouldn't have worked and it would have got launched out of a window My two cents Phill My System Specs
 22 Jul 2014 #18 ICIT2LOL Desk1 7 Home Prem / Desk2 10 Pro / Main lap Asus ROG 10 Pro 2 laptop Toshiba 7 Pro Asus P2520 7 & 10 18,998 posts Central West NSW I agree with Phill as one might have guessed for the small extra a bit of overkill goes a long way. Bit like having a 200hp engine in a car as opposed to having a 150hp one - it simply doesn't have to work so hard. A no brainer really. My System Specs