home bbs files messages ]

Forums before death by AOL, social media and spammers... "We can't have nice things"

   sci.electronics.basics      Elementary questions about electronics      72,318 messages   

[   << oldest   |   < older   |   list   |   newer >   |   newest >>   ]

   Message 71,575 of 72,318   
   whit3rd to Commander Kinsey   
   Re: Problems with 12V and 5V lines on a    
   20 Feb 20 19:39:41   
   
   From: whit3rd@gmail.com   
      
   On Wednesday, February 19, 2020 at 11:43:15 AM UTC-8, Commander Kinsey wrote:   
      
   > The supplies I'm having bother with are not that old, probably 5 years.  But   
   they were the second cheapest.  They also lie on their specs.  They're sold as   
   850W supplies, but you can only draw 650W of that on the 12V line, which is   
   where 99% of the    
   power goes in a modern PC.   
      
   Some modern PCs, sure.   The 'specs' proably told you about that 650W limit,   
   and   
   that means they were NOT lying.     
      
   > Nowadays, aren't all the chips running at about 1V and powered by their own   
   VRMs, fed off the 12V line?   
      
   Only the  CPUs, high-density LSI and some RAM use those low voltages; it's a   
   scaling thing.   
   The mobile-PC crowd uses 12V raw power with DC/DC converters to provide ALL   
   the ATX   
   power pins' outputs; you might consider a 12V-only source instead of an ATX   
   supply   
      
      
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

[   << oldest   |   < older   |   list   |   newer >   |   newest >>   ]


(c) 1994,  bbs@darkrealms.ca