OT? power reqs of DDR2 chips
Rick Stevens
rstevens at internap.com
Tue May 22 18:34:32 UTC 2007
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
>
> --
> fedora-list mailing list
> fedora-list at redhat.com
> To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list
----------------------------------------------------------------------
- Rick Stevens, Principal Engineer rstevens at internap.com -
- VitalStream, Inc. http://www.vitalstream.com -
- -
- Consciousness: that annoying time between naps. -
----------------------------------------------------------------------
More information about the fedora-list
mailing list