Re: OT? power reqs of DDR2 chips

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On Tue, 2007-05-22 at 11:26 -0700, Les wrote:
> On Tue, 2007-05-22 at 06:56 -0700, Wolfgang S. Rupprecht wrote:
> > potential accesses.
> 
> Hi, Wolfgang,
> 1.     Power factor is the correct term.  Due to transmission line
> effects the current leads the voltage, and that error produces the
> heating effect that varies with directly with speed and line length.
> I am a test specialist for integrated circuits.  I do use my terms
> correctly.

Uh, isn't "transmission line effect" (common name) really called
"inductive reactance"?  Capacitive reactance has the opposite effect
(voltage leads current).

It's been a while since I was in EE school.

> 2.  All ram moves are block moves with recent processors.  This is due
> to the management of cache memory which may be two levels deep on
> current microprocessors.
> 
> 3.  I believe I did state that hardware was a significant cause of
> power demand.  I was illustrating the need for additional headroom on
> the supply to deal with the surges that occur during electronics data
> state changes.
> 
> No one here needs to believe any of this, because in most cases the
> participants will order prebuilt systems which will have properly
> sized supplies to deal with the board demands.  Generally the
> designers build and test the systems with memory demands that are much
> greater than as you point out the average demand may be.
> 
>     The gentleman here is building a high end system.  4 processors
> (two CPU's) is a lot of processing power.  Thus it is reasonable to
> expect that the system may be running at high capacity, thus more
> block moves and greater throughput demands on the hardware.
> 
> Regards,
> Les H
> 
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