[mythtv-users] Backend Hardware Questions

[Henk D. Schoneveld]

On 16 Jan 2015, at 21:57, Hika van den Hoven <hikavdh at gmail.com> wrote:

> Hoi Henk,
> 
> Friday, January 16, 2015, 9:37:05 PM, you wrote:
> 
> 
> 
>> On 16 Jan 2015, at 20:44, Hika van den Hoven <hikavdh at gmail.com> wrote:
> 
> 
>> Hoi Henk,
> 
>> Friday, January 16, 2015, 8:14:41 PM, you wrote:
> 
> 
> 
>> On 16 Jan 2015, at 19:47, Henk D. Schoneveld <belcampo at zonnet.nl> wrote:
> 
> 
> 
> 
>> On 16 Jan 2015, at 19:03, Jan Ceuleers <jan.ceuleers at gmail.com> wrote:
> 
> 
>> On 16/01/15 11:36, Henk D. Schoneveld wrote:
> 
>> I would suggest check power-consumption first with a Kill-Watt device,
>> most PSUs are way to big and are most efficient when loaded at > 75% of
>> max capacity. HD’s don’t use that much power.
> 
> 
>> Power supplies need to be dimensioned not for average load but peak
>> load. Which occurs at boot when the disks all spin up at more or less
>> the same time.
> 
>> So unless you have a fancy controller that spins the disks up one by one
>> you need a lot of headroom on top of the system's average load after boot.
> 
>> You can watch what booting needs, you’ll probably surprised how low
>> it is. Of course you can also encode multithreaded and see how high it goes.
> 
>> MAX TDP of X4 B50 =95W 
>> Under max. load with 5 - 8 drives it will < 150W
> 
> 
> 
> 
> 
> 
>> You made your point. But, running stationary to close to max can
>> decrease live expectancy and increase chances of instability, where
>> the latter also goes for running to low. Plus not leaving space for
>> incidental peak loads.
>> So a save bet in my estimation is to take twice or a little more than
>> the stationary use.
>> While maybe not optimal in power consumption, it ensures maximum
>> stability. Which I think is the main objective.
> 
> 
> 
>> Satbility in my opinion means that where 3.3V is required that it
>> will be always available as well  as the 1.0V and  2.2V etc Voltages.
>> Evidence please.
> 
>> I’ve run i5 3.3GHz cpu’s encoding multiple files at once on a 12V
>> 75W external PSU, draws 90W from the wall, according to a Kill A
>> Watt. No problem running foor hours.
> 
> And days, months, years???
> Stability is not just the moment.
For about 18 months now. Worst case the external power supply gets to often too hot and dies. This power supply is available at 15,00 Euros. My MiniITX case with that PSU costs < 40,00 Euros incl. VAT
> 
> 
> Tot mails,
>  Hika                            mailto:hikavdh at gmail.com
> 
> "Zonder hoop kun je niet leven
> Zonder leven is er geen hoop
> Het eeuwige dilemma
> Zeker als je hoop moet vernietigen om te kunnen overleven!"
> 
> De lerende Mens
> 
> _______________________________________________
> mythtv-users mailing list
> mythtv-users at mythtv.org
> http://lists.mythtv.org/mailman/listinfo/mythtv-users
> http://wiki.mythtv.org/Mailing_List_etiquette
> MythTV Forums: https://forum.mythtv.org