Re: cpufrequency
Re: cpufrequency
- Subject: Re: cpufrequency
- From: Michael Smith <email@hidden>
- Date: Wed, 14 Jun 2006 19:08:06 -0700
On Jun 14, 2006, at 12:48 PM, Dirk Schelfhout
<email@hidden> wrote:
I'll put some more effort in trying to install linux on it.
Speaking as one of the "mole people" (thanks, Ethan 8) alluded to
here, I can
tell you that this won't necessarily help you very much.
What range of frequencies do you believe affects you? The currently
shipping
Core Duo systems have a useful frequency range of about 1.5-2.16GHz;
there is little or nothing to be saved in terms of power by running
them below
1.5GHz so nobody supports this.
It is not currently possible to jam Mac OS X on Intel Macintoshes
into a 'lower'
freqency range; some systems run at a fixed maximum frequency while
others
are frequency-agile. In either case, the system attempts to deliver
maximum
performance, and reducing the operating frequency is not consistent
with that.
If that doesn't work I'll have to sell it and buy a pc that can drive
the monitor. ( I believe on pc's you can set it in the bios. That's
what a pc friend told me )
Very few PC systems support this, and on most of those Windows will
ignore
the BIOS settings. You may find an alternative system that doesn't
give you
a headache, but it won't be because you've managed to make it run
slower.
It is perhaps worth noting, in passing, that the CPU frequency is
among the least
likely to be directly or indirectly radiated by your Mac. To begin
with, it has one
of the shortest wavelengths, meaning that it is attenuated by a great
many things
including the chassis and your skull.
Then, there is the fact that it is entirely generated and contained
within the CPU,
meaning that it is comprehensively shielded by the die substrate,
heatsink and PCB
power planes beneath the socket. The power supply to the CPU is
extremely
heavily decoupled, meaning that clock radiation from power lines is
suppressed
as well.
There are a number of other timing domains with much more viable
radiation
capabilities (various I/O busses, LCD panel scan, power supplies, LCD
inverter etc.)
although bear in mind that these systems are extensively shielded
with an eye to
minimising external radiation, and none of these domains are affected
by changing
the speed of the CPU.
Equivalent timing domains are likely to be similar or identical on
any modern
Intel- or AMD-based system.
= Mike
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