Newsgroup: it.comp.macintosh
Titolo: [SPECULAZIONE] I g5 hanno l'opzione di risparmio energetico....

A Spymac thread posted this weekend reveals some screenshots and 
information about a feature of the new PowerMac G5's called "Slewing".
The feature is located in the Energy Saver Control Panel and allows the 
user to make some modifications to the Processor and Bus performance 
settings. A concept that is familiar to laptop owners... the G5 can be 
run in Reduced, Highest and Automatic performance settings.
Details on the various modes are provided in Apple's Developer 
Documentation.
To lower power consumption, heat generation, and fan noise, the Power 
Mac G5 computer incorporates an automatic power management technique 
called bus slewing. Bus slewing is designed to run at high processor and 
bus speeds and high voltage when the demand on the processor is high, 
and to run at low processor and bus speeds and low voltage when the 
demand on the processor is low.
Speed ranges involved start from 1.3GHz up to the highest rated GHz of 
the chip (1.6, 1.8, or 2.0). The default slewing option for the PowerMac 
G5s is Automatic, and the processor and bus speeds are modulated 
seamlessly to the user.
According to our contacts, there should be no performance loss in 
Automatic mode.
That being said, at least one user (in the previously mentioned thread) 
claims an 11 point increase in their Xbench score after changing their 
Slewing mode from Automatic to Highest. However, readers are reminded 
that XBench has been inconsistent in producing reproducible benchmark 
numbers -- even on the same machine. MacRumors' reader 1stunna managed 
to get a 11 point increase in Xbench scores by simply rerunning the test 
three times, with no other changes to the system. Whether this 
represents test-to-test variability or a side-effect of the processor 
automatically ramping up is still up for debate.
Update: More details found in this Ars Thread:
The ramp time up or down is ~1ms, but the CPU is running normally during 
this time, so there is no performance "hiccup". This results in about 
60% power/heat savings, which jumps up to about 85% savings if the 
machine is idle and they "turn on other power saving features". When 
idle, the CPU fans are barely turning.
... e se i PowerBook G5 fossero più vicini di quanto ci aspettiamo? 
Magari Natale?
-- 
Jollino [it,en,es,ia,eo (fr,pt,ca)]
Per rispondere togli il freno a mano
"Avrei voluto essere un bravo studente, un bravo figlio, un bravo
fidanzato / o almeno uno dei tre"

 Magari Natale?
Benissimo!
Se hai ragione ti permetterò di regalarmene uno! :o))))

 Se hai ragione ti permetterò di regalarmene uno! :o))))
Ma anche due ;)


 Ma anche due ;)
Ovvio...col risparmio energetico succitato si risparmia sulla bolletta e
si possono mettere da parte i soldi per comprare i G5.
Tampano
-- 
Non e' questione di ferire sensibilita', ma di ammazzarle!
Susanita

 si possono mettere da parte i soldi per comprare i G5.
Ma se il risparmio energetico è del g5 e io ho un g4, come faccio a 
comprarmi un g5? :)


 Magari Natale?
...parigi?
dopotutto visto che hanno gia' aggiornato ipod e imac, panther e i nuovi
pb dovrebbero essere l'evento del 16 settembre! che ci viene a fare
senno' jobs in europa? 
-- 
"i was high, but she was the sky"
use the condom. remove it to reply.

 senno' jobs in europa? 
va a salutare il suo amico con cui parò via ichat av alla presentazione 
ufficiale :)
no, secondo me rinnova la linea dei pbook (forse anche gli ibook?), 
presenta la roba wireless e poi boh...
