On Jul 27, 9:22*am, Jeff Liebermann wrote:
On Thu, 26 Jul 2012 22:57:25 -0400, "Tom Del Rosso"

wrote:
When a mobo has bad caps the PSU shuts down, but what triggers it? *What
does the PSU see from its point of view? *Peak current spikes?

The purpose of the caps that are close to the CPU is to reduce the
ripple on the processor power line to tolerable levels. *The processor
can go from zero to 40 amps at anywhere from zero (ground bounce) to
GHz rates. *The capacitors have to smooth all that out. *Basically,
they form an energy storage system to deliver power during the high
current spikes to the power hungry CPU.


I'm going to expose my ignorance he are there not also small value
capacitors in parallel, to take care of the GHz spikes?