On Thu, Feb 18, 2010 at 10:35 PM, objectwerks inc <[email protected]> wrote: > > On Feb 18, 2010, at 5:16 PM, George N. White III wrote: > >> On Thu, Feb 18, 2010 at 1:47 PM, objectwerks inc <[email protected]> >> wrote: >>> >>> On Feb 18, 2010, at 7:49 AM, LuKreme wrote: >>> >>>> On 18-Feb-2010, at 04:58, George N. White III wrote: >>>>> >>>>> I had a Mac Pro (fully loaded with 1TB drives) in my office last >>>>> winter -- kept me very warm, but overheated in May (I live in Nova >>>>> Scotia) so we moved it to an A/C machine room and put an iMac in my >>>>> office. The MP was also quite loud, and needed a big (and loud) UPS >>>>> as well (the manual specifies a 12amp circuit). >>>> >>>> Really? My MacPro is dead silent. The loudest thing on my computer is the >>>> external hard drive case, which I usually leave turned off because of the >>>> noise. But when it's off, the computer is so quiet I can't hear it at all >>>> from 2 feet away. >>> >>> >>> Really? My MP is relatively loud -- I can hear the fans or drives or >>> something in the next room. But when sitting right next to it I have tuned >>> it out and don't really notice it unless I think about it. >>> >>> The fans are low RPM noise --- not PC type fan noise. Kind of a lowish >>> rumble. >>> >>> Comparatively it is quiet but not at all like a mini or anything that >>> really is pretty dead quiet most of the time. >> >> I think the fans are temperature dependent. 4TB of disks spinning >> and with all 8 cores busy was like having a hair dryer running under >> my desk fighting with a blast of cold air from the windows on the >> other side. > > What generation is this? My MP is the generation that came out in early 2008 > with 2.8/3.0/3.2 processors. I usually have 4 Hitachi 750gb drives though > one is temporarily removed. I also have the NVidia Quadro FX 5600 and an ATI > Radeon 2600 video cards in the machine. And 16GB of RAM. It is not lightly > outfit. I never have this happen with the fans even when the all 8 cores are > busy for an extended period. My older G5 does howl like a Banshee when it > picks up the load but this one always has a low rumble of HD and fans > spinning at low speed.
The systems are quiet when they aren't being used. We have 3 of the early 2008 models, all with 4 Apple 1TB disks and 8GB RAM and dual Apple Nvidia GPU's. We usually buy the lowest clocked CPU's since our workloads are mostly I/O bound. The 1TB disks consume 24 watts each, newer 1TB drives are 1/2 that. We run with of 3 drives in a stripped RAID, so all 4 drives are running under normal workloads. We are still using Leopard. With our machines the case gets warm and you feel the blast of warm air when the system is working hard. I lost the machine I was using to monitor the UPS, so I can't say what the actual power load is, but if you add up the drives, CPU's, and GPU's it must need around 500 watts, which means another 100 in the PS. A steady 600 watts or roughly 6 amps is consistent with Apple specs for a 12amp supply, just right for a 1200-1500 KVA US on a dedicated 15 amp circuit. There have been some problems with the fans not responding to high CPU temps doing audio processing in Snow Leopard <http://reviews.cnet.com/8301-13727_7-10452185-263.html?tag=mncol;title> > > Are your dust filters full and it is not pulling good air through? Is the > inside coated with dust and not giving off heat well? > The systems are still very clean inside and the blast of air is hard to miss, so I think airflow is OK. > Until a few weeks ago it was in my basement apt, which is quite cold but not > below 0C (10C or less) but is now in the upstairs office where it stays > around 15-19C during the winter (we keep the heat turned down to 66F during > the day and 60F at night). > > Chad > > >> It was hard for people to hear me on the phone over all >> that racket. Even at -10C in winter my office (which is only lightly >> insulated and windows whose gaskets were blown out during a hurricane >> -- it is about to get new insulation and windows) stayed above 25C, >> and at +10C the office went to 35C and the disks were getting close to >> the recommended max. temp. >> >> >> -- >> George N. White III <[email protected]> >> Head of St. Margarets Bay, Nova Scotia >> _______________________________________________ >> MacOSX-talk mailing list >> [email protected] >> http://www.omnigroup.com/mailman/listinfo/macosx-talk > > -- George N. White III <[email protected]> Head of St. Margarets Bay, Nova Scotia _______________________________________________ MacOSX-talk mailing list [email protected] http://www.omnigroup.com/mailman/listinfo/macosx-talk
