Desktop with DVS

Desktop with DVS

[Zhijian Lu]

Hello,

This may be off the loop. But does anyone know if there are 
any desktop computers with dynamic voltage scaling capacity?

Thank you for your information.

Zhijian

Re: Desktop with DVS

[Dominik Brodowski]

[-- Attachment #1.1: Type: text/plain, Size: 946 bytes --]

On Mon, Mar 22, 2004 at 01:36:48PM -0500, Zhijian Lu wrote:
> Hello,
> 
> This may be off the loop. But does anyone know if there are 
> any desktop computers with dynamic voltage scaling capacity?

For x86{,_64}: AFAIK there are several choices: 
- some x86_64 AMD [server] processors and mainboards support 
  voltage scaling,
- there are some special mainboards which support Intel Pentium M processors
- the transmeta efficeon CPU supports dynamic voltage scaling without
  any operating system interaction
- maybe some others (VIA) which I've missed.

Please note that unless you chose Transmeta CPUs, you also need support from
the operating system to _dynamically_ change the frequency. This should be
implemented in form of a cpufreq governor; some thus patches have been
discussed on this mailing list, none have been in a mergeable state. But you
can find them in the archives, if you look hard :-)

	Dominik




[-- Attachment #1.2: Type: application/pgp-signature, Size: 189 bytes --]

[-- Attachment #2: Type: text/plain, Size: 143 bytes --]

_______________________________________________
Cpufreq mailing list
Cpufreq@www.linux.org.uk
http://www.linux.org.uk/mailman/listinfo/cpufreq

Re: Desktop with DVS

[Bruno Ducrot]

On Mon, Mar 22, 2004 at 09:17:33PM +0100, Dominik Brodowski wrote:
> On Mon, Mar 22, 2004 at 01:36:48PM -0500, Zhijian Lu wrote:
> > Hello,
> > 
> > This may be off the loop. But does anyone know if there are 
> > any desktop computers with dynamic voltage scaling capacity?
> 
> For x86{,_64}: AFAIK there are several choices: 
> - some x86_64 AMD [server] processors and mainboards support 
>   voltage scaling,

That is not reserved to server.  Most modern UP desktops shipped with AMD64 
do have what is called now 'cool'n quiet' technology, and should be supported
by the powernow-k8 driver (you have to be sure that itt's enabled, though.
Some northbridges do not allow this unfortunatelly, even though the processor
is capable of that).

> - there are some special mainboards which support Intel Pentium M processors
> - the transmeta efficeon CPU supports dynamic voltage scaling without
>   any operating system interaction
> - maybe some others (VIA) which I've missed.

-- 
Bruno Ducrot

--  Which is worse:  ignorance or apathy?
--  Don't know.  Don't care.

Re: Desktop with DVS

[Drew Varner]

Can someone point me to a specific AMD64 desktop that they've gotten to
work with cpufreq (i.e. one with a suitable northbridge)? I'd like to
purchase a cpufreq-savvy desktop.

- Drew

On Mon, 2004-03-29 at 08:50, Bruno Ducrot wrote:
> On Mon, Mar 22, 2004 at 09:17:33PM +0100, Dominik Brodowski wrote:
> > On Mon, Mar 22, 2004 at 01:36:48PM -0500, Zhijian Lu wrote:
> > > Hello,
> > > 
> > > This may be off the loop. But does anyone know if there are 
> > > any desktop computers with dynamic voltage scaling capacity?
> > 
> > For x86{,_64}: AFAIK there are several choices: 
> > - some x86_64 AMD [server] processors and mainboards support 
> >   voltage scaling,
> 
> That is not reserved to server.  Most modern UP desktops shipped with AMD64 
> do have what is called now 'cool'n quiet' technology, and should be supported
> by the powernow-k8 driver (you have to be sure that itt's enabled, though.
> Some northbridges do not allow this unfortunatelly, even though the processor
> is capable of that).
> 
> > - there are some special mainboards which support Intel Pentium M processors
> > - the transmeta efficeon CPU supports dynamic voltage scaling without
> >   any operating system interaction
> > - maybe some others (VIA) which I've missed.

Desktop with DVS

[biciolinux]

>> > This may be off the loop. But does anyone know if there are 
>> > any desktop computers with dynamic voltage scaling capacity?
> 
> >For x86{,_64}: AFAIK there are several choices: 
> >- some x86_64 AMD [server] processors and mainboards support 
> >  voltage scaling,

>That is not reserved to server.  Most modern UP desktops shipped with AMD64 
>do have what is called now 'cool'n quiet' technology, and should be supported
>by the powernow-k8 driver (you have to be sure that itt's enabled, though.
>Some northbridges do not allow this unfortunatelly, even though the processor
>is capable of that)

Please, is possible to know which northbriges-motherboard are supported?

Re: Desktop with DVS

[Sebastian Witt]

biciolinux@aliceposta.it wrote:

 >>>> This may be off the loop. But does anyone know if there are any 
desktop computers with dynamic voltage scaling capacity?
 >>
 >>
 >>> For x86{,_64}: AFAIK there are several choices: - some x86_64 AMD 
[server] processors and mainboards support voltage scaling,
 >
 >
 >
 >> That is not reserved to server.  Most modern UP desktops shipped 
with AMD64 do have what is called now 'cool'n quiet' technology, and 
should be supported
 >> by the powernow-k8 driver (you have to be sure that itt's enabled, 
though.
 >> Some northbridges do not allow this unfortunatelly, even though the 
processor
 >> is capable of that)
 >
 >
 >
 > Please, is possible to know which northbriges-motherboard are supported?
 >

Many nForce2-based boards are using a Attansic ATXP1 chip. With this 
chip it's possible to dynamically change the processor voltage (Epox 
8RDA serie: 1.075V - 2.2V).

Other boards:

Abit NF7
Aopen AK79D-400VN
Chaintech CT-7NJ(S,L1)
DFI Infinity NFII Ultra
DFI Lanparty NFII Ultra
Leadtek K7NCR-18D
Shuttle AN35N Ultra
Soltek 75FRN(2)-L

But the nForce2-chipset doesn't support AMD mobile CPUs, so it's maybe 
not the best for this.

Bye,
Sebastian

Re: Desktop with DVS

[Marcin Kałuża]

On Sunday 13 of June 2004 19:40, Sebastian Witt wrote:
> Many nForce2-based boards are using a Attansic ATXP1 chip. With this
> chip it's possible to dynamically change the processor voltage (Epox
> 8RDA serie: 1.075V - 2.2V).
>
> But the nForce2-chipset doesn't support AMD mobile CPUs, so it's maybe
> not the best for this.
I'm not sure if it's completely true - browsing different forums on NF2 I find 
sometimes that people have mobile amd + NF2 in their descriptions so maybe it 
works.
You would have to search for such people and talk to them about it
greetz
Martin

Re: Desktop with DVS

[Sebastian Witt]

Marcin Ka?uz.a wrote:
 > On Sunday 13 of June 2004 19:40, Sebastian Witt wrote:
 >
 >>Many nForce2-based boards are using a Attansic ATXP1 chip. With this
 >>chip it's possible to dynamically change the processor voltage (Epox
 >>8RDA serie: 1.075V - 2.2V).
 >>
 >>But the nForce2-chipset doesn't support AMD mobile CPUs, so it's maybe
 >>not the best for this.
 >
 > I'm not sure if it's completely true - browsing different forums on 
NF2 I find
 > sometimes that people have mobile amd + NF2 in their descriptions so 
maybe it
 > works.
 > You would have to search for such people and talk to them about it

Yes, the CPU works in that boards. But the Mobile function (dynamic FID 
changing) is not (yet?, it seems this functions are not implemented) 
available on NF2 chipsets.

Bye,
Sebastian