On Wednesday 25 January 2006 05:12, Jo Shields wrote: > Robert Tsai wrote: > >On Tue, Jan 24, 2006 at 09:37:24PM +0100, Marius Schrecker wrote: > >>>Tom Dombrosky wrote: > >>>>On 1/24/06, *Steve Adeff* <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>> > >>>>wrote: > >>>> > >>>> On Tuesday 24 January 2006 12:34, Michael Starks wrote: > >>>> > I have been thinking of using a laptop CPU to save power on > >>>> > a new MythTV system. Basically, I'd like to be able to use > >>>> > the cpuspeed daemon to drop the CPU speed when there isn't > >>>> > a lot going in. Has anyone done with with a full-size > >>>> > mainboard? Any other tips? > >>>> > >>>> laptop CPU's use different sockets, etc. I believe some of > >>>> the new mini boards (BTX or something?) use laptop cpu's. I > >>>> also believe desktop cpu's support the cpu speed daemons. > >>>> > >>>>The Athlon laptop cpus use the same socket. They will work fine. > >>> > >>>A really minor modificatio can turn a normal Athlon XP into a > >>>mobile athlon too - which enables you to use the athcool stuff > >>>under linux. It's pretty straight forward and there's plenty of > >>>stuff on doing it out there. > >> > >>What about the 64 family, any mods there? I'm using an Athlon 64 > >>3700+ San Diego (socket 939) which has pretty good voltage/speed > >>stepping, although I'd love to be able to drop the lowest step even > >>more. If anyone knows a mod for that I'd love to know! The kernel > >>module seems to read the stepping info direct from the cpu or bios, > >>and I haven't found a way to manipulate this manually, although > >>googling suggests that a further 10% cut in voltage should be > >>possible. > > > >How slow are you trying to go? > > > >I have an Athlon64 3500+ Winchester. By default, the cpufreq-ondemand > >governor only lets it go from 2.2GHz down to 1.8GHz. I had to tweak it > >manually to drop it down to 1.0GHz (nothing available in between): > > > > # cpufreq-set --min 1000000 --governor ondemand > > > >[This is software only; no mucking around with voltage on the > >motherboard.] > > > >--Rob > > There are desktop boards with Socket 479 on them - the form factor used > by Intel's low-heat low-power high-speed Pentium-M chips - a Dotha-core > Pentium-M is usually a little faster than an Athlon64 running at an > identical clock speed. It also works fine with assorted cpufreq > handlers, and can idle pretty slow as needed, then ramp up automatically > when needed. > > My 1.7Ghz Dothan sits at 800MHz most of the time, and the > temperature-controlled CPU fan rarely if ever bothers to spin. > > The problem (of course) is that Pentium-M, and compatible motherboards, > are expensive.
how "safe" is letting the CPU change its speed? will it affect how applications run or is it seamless? -- Steve _______________________________________________ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
