G5 was called one time by Bruce a space heater. I can attest that when my old G5 was stressed, the fans sounded like a Jumbo taking off. By comparison, Intel CPUs are way better with their power.
One explanation as to why Windows will show a much higher power consumption may be related to the fact that it is emulated? As for the power consumption vs. voltage, a higher supply voltage is a bit better than lower one: less loss due to lower current, but the values are not significant. Thanks for sharing. Cheers, Naftali > On Oct 15, 2016, at 7:24 PM, GMail Valter Psicof <[email protected]> > wrote: > > Hi all! > > Today I measured various levels of power consumption of my Early 2009 iMac > 24" 2.93 GHz (Intel Core 2 Duo processor). > In case someone may be interested, I thought about sharing them here :-) > > My iMac has 6 GB Ram, and an ATI Radeon HD 4850 graphic card with 512 MB. > I set the screen brightness to minimum (System Prefs / Monitor). > I tested it with OSX 10.6.8 and Windows 7 (via Bootcamp). > A different hardware configuration and/or OS version might produce somehow > different values. > > Values are in Watts, with a 220V voltage (I live in Italy). > (I am unsure whether using a different voltage means different Watt numbers) > I used a meter called SavePower PM-6300, similar to the Kill-A-Watt common > in the USA. Not very accurate, but good enough for this purpose. > > *** Mac OSX 10.6.8 > - Off = 2 > - Stop (sleep) = 2-3 > - Idle at desktop (no open apps) = 88-90 > - Idle with screen off = 44-46 > - Idle loaded (3 GB Ram occupied) = 90-92 (+2) > - Call of Duty 2 playing = 145-155 > > *** Windows 7 (Bootcamp) > - Idle at desktop (no open apps) = 102-112 > (102 after boot - 112 after some use) > - Idle with screen off = 68-70 > - Firefox open = 113 > - Sniper Elite III playing (+ Steam on) = 162 > > Notice the higher power efficiency of OSX over Windows: just being idle at > desktop (basic consumption), Windows draws around 20W more than OSX. > With screen off (not dimmed, completely off), there's even an higher > difference: Windows draws 24W more. > And that happens even having more background processes open in OSX than in > Windows (I use Windows just for gaming). > > For a comparison with the old PPC times, my PowerMac G5 2.7 GHz DP with > Radeon 9600 XT drew between 160W at idle and 310W playing Call of Duty 2! > And this was just the CPU, without the monitor. > > HTH, > Valter > > > -- > You received this message because you are a member of the iMac Group, a group > for those using Apple iMacs and eMacs. > The list FAQ is at http://lowendmac.com/imac/list.shtml and our netiquette > guide is at http://www.lowendmac.com/lists/netiquette.shtml > To post to this group, send email to [email protected] > To leave this group, send email to [email protected] > For more options, visit this group at http://groups.google.com/group/imaclist > > --- > You received this message because you are subscribed to the Google Groups > "iMac Group" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are a member of the iMac Group, a group for those using Apple iMacs and eMacs. The list FAQ is at http://lowendmac.com/imac/list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To leave this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/imaclist --- You received this message because you are subscribed to the Google Groups "iMac Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
