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New PowerMac G5s: Up to 2.5Ghz, Liquid Cooled

Posted by Hemos on from the making-the-fast-faster dept.

no_demons writes "Apple have just announced the new, completely dual-processor PowerMac G5 lineup. The models all sport an 8x SuperDrive, whilst new the dual-2.5GHz model also features an 'innovative liquid cooled heat sink,' available in July."

5 of 1,009 comments (clear)

  1. Liquid Cooling by swordboy · · Score: 5, Interesting

    I like the idea of liquid cooling but I also like simple systems. There's too much complexity here. So...

    I've often pondered creating a sealed aluminum case with integrated heatsink. Stick the components in and fill it with dielectric oil in order to create a huge, passive heat sink (like a big transformer or whatever). Thoughts? I almost got around to this but stopped after submerging an old hard drive in some dielectric - if you seal the breating hole, it works fine (I believe the hole is there to relieve pressure differentials caused by changes in altitude so it should be fine in a stationary location).

    Provided that the dielectric has good enough heat transfer, this should work, no?

    --

    Life is the leading cause of death in America.
  2. Re:Nothing left for Modders by Gotung · · Score: 5, Interesting

    I disagree. This is what I did to mine: http://www.buckeyemonkey.com/images/dualblue2.jpg

  3. Re:cool by RebelWebmaster · · Score: 5, Interesting

    Well, IBM was the first to go on record as saying that 90nm was considerably more difficult to implement than they first expected. There's a lot of current leak going on, meaning wasted power, which leads to increased heat (see Intel's Prescott as a very good example). Supposedly AMD's having some 90nm issues as well now.

    I guess those issues would explain why Apple had to switch to liquid cooling for this round of systems.

  4. LOOK at the INTERNAL design by goombah99 · · Score: 5, Interesting
    I think I was more blown away with the side bar showing the internal design. Now I understand why the mac G5 is slightly bigger than a PC case and why macs dont have multiple front panel drive bays. there are clear front to back air channells. so air can trully be swept through in one pass. just look at that crammed pc case : it looks as useful as a square suace pan would be on you stove. the cpu fan vents in to a poorly stirred airmass. you cant even put output fans or input fans in logical places since all of the back is taken up with power supply and PXI car slots and the front is covered with drive bays. There are endless nooks and heaps of wire. and most of the air lives in a blob above the motherboard never in contact with it.

    in contrast the mac case has layers of flowing air no thicker that what is probably the thermal diffusion length. Air flows over the top and bottom of the hotest items and does so in one pass. Its beautiful. and mac planned this out from the beginning for expandability.

    besides I like the cheese grater.

    --
    Some drink at the fountain of knowledge. Others just gargle.
  5. Re:Clock speed by EccentricAnomaly · · Score: 5, Interesting

    For my applications un-optimised code on a 2 Ghz G5 runs about the same as on a 3 Ghz Pentium and a 2.4 Ghz Xenon, if I optimise the G5 code with xlf and shark I get my 2 Ghz G5 to run twices as fast as the Pentium or Xenon... but I don't have the intel compiler for the P4 or Xenon so that's not a fari comparison.

    Anyway I expect this new G5 to greatly outperform a P4.

    --
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