New power supply causes computer to run hot?

TimTim Southwest PA Icrontian
edited December 2004 in Hardware
The Antec 350 I got yesterday is working, and the fans are running and blowing in the proper direction, but things aren't right. I edited and uploaded one of my webshows today and the processor did it as good as always, but folding is screwed up.

Before the power supply quit, it was folding a frame in THIS work unit about once every 1 munite 20 seconds. Today it was taking 5 minutes, and I just came in and saw it reading 13+ minutes!

Case temps are up 1-2 degrees, CPU is up 5. And that's AFTER I put the CPU back to its stock 1.83 Ghz from 2.20! 2.20 was much hotter.

All this from changing a power supply? I may try deleting and reloading folding in case one of its files got screwed up somehow.

Comments

  • mmonninmmonnin Centreville, VA
    edited December 2004
    I thought you made this thread already. Someone else replied to it. Then you did. Then I did again. Where did it go?

    I see, its in a different forum. Dont start duplicate threads.
  • TimTim Southwest PA Icrontian
    edited December 2004
    This is kind of a part 2 to the original post. After playing around with things today and trying a full delete / reload of folding@home, it runs a little better but is still running hotter by 5 degrees on the cpu. I'm at 28 case / 49 cpu right now.

    I can't imagine why changing the power supply would do this. Nothing else got disturbed in the case that I can see.
  • GrayFoxGrayFox /dev/urandom Member
    edited December 2004
    The antec psus pull less air to keep the quiet
    change the fans in the psu to tornados ;D that should bring temps down 10C
  • TimTim Southwest PA Icrontian
    edited December 2004
    The Powmax supply drew air in from the front side and blew it out the back. This Antec pulls air in from the bottom (right beside the CPU) and blows it out the back.

    Could it be that since it's not pulling out as much air that more heat stays inside the computer case?

    Taking the power supply apart will void its warranty. But I could do it. Does it take standard size fans? Can't the original fans be rewired to get 12 volts full power ALL the time? It would probably have 3 wires going to the fan motor, just cut the extra one so it only gets 12+ and ground?
  • profdlpprofdlp The Holy City Of Westlake, Ohio
    edited December 2004
    Tim wrote:
    The Powmax supply drew air in from the front side and blew it out the back. This Antec pulls air in from the bottom (right beside the CPU) and blows it out the back.
    Actually, AMD recommends the bottom>>rear path over the front>>rear. It draws more heat from the CPU area that way.
    Could it be that since it's not pulling out as much air that more heat stays inside the computer case?

    If that is the case, then definitely.
    Taking the power supply apart will void its warranty. But I could do it. Does it take standard size fans? Can't the original fans be rewired to get 12 volts full power ALL the time? It would probably have 3 wires going to the fan motor, just cut the extra one so it only gets 12+ and ground?


    Does your case have room for more fans? In conjunction with the bottom>>rear path on the PS, AMD also recommends an intake fan at the lower front of the case. This gets cool air coming in the front of the case, passing over the CPU, then exiting through the PS.

    Cooling is a topic on which there can be much disagreement, with two seemingly opposing viewpoints both being correct - for their individual circumstances. With all of the variables at play, (case size & design, the size and location of PCI cards, HD's, etc), the only "right" answer is the one that works for your specific configuration. Personally, I've had the best results when using a robust exhaust fan at the rear of the case and an intake fan on the side of the case opposite the MB blowing directly onto the CPU.
  • TimTim Southwest PA Icrontian
    edited December 2004
    I have one of the unused CD drive bay plastic covers removed on the front of the case so that airflow has a DIRECT (straight line) path into the case, over the CPU, and out the back via 2 80 mm exit fans.

    The rear exit fan on the power supply definitely does not blow air out anywhere near as hard as the Powmax fan did.
  • Geeky1Geeky1 University of the Pacific (Stockton, CA, USA)
    edited December 2004
    The fans on the antec are thermally controlled. The fans on the powmax probably weren't. You can set them up to run full speed all the time if you want to. Or you can fix the actual problem, which is that your case cooling apparently sucks. :-/
  • TimTim Southwest PA Icrontian
    edited December 2004
    How can I set the fans to run full speed all the time?
  • Geeky1Geeky1 University of the Pacific (Stockton, CA, USA)
    edited December 2004
    you take the PS apart and re-wire the fans?
  • TimTim Southwest PA Icrontian
    edited December 2004
    Well yeah, but I need DETAILS. Cut this wire, connect that wire to there, things like that. :rolleyes:
  • NiGHTSNiGHTS San Diego Icrontian
    edited December 2004
    Try googling, see what that brings up.
  • Geeky1Geeky1 University of the Pacific (Stockton, CA, USA)
    edited December 2004
    you'll have to wait until i can get home and take some pics of my SL350 for a more detailed description :-/
  • profdlpprofdlp The Holy City Of Westlake, Ohio
    edited December 2004
    Tim, I tried to find a nice diagram of the thermal regulator for your PS, but had no luck.

    How is your computer running overall? Your current temps of "28 case / 49 cpu" are not terrible by any means. If the computer is stable and those are the temps you're getting with Folding running I'd be inclined to not worry about it. Messing around with the PS thermal regulator will certainly void your warranty. If you get it wrong it could fry the whole computer.

    One other thing to consider: When you replaced your old PS you undoubtedly kicked up a lot of dust inside the case. When was the last time you removed your CPU heatsink fan and cleaned everything out thoroughly? I just did mine a month ago and my CPU temp has already risen 3-4 degrees (two hairy dogs in the house...) Try cleaning it out and adding a new layer of thermal paste when you reinstall it. (Get rid of the "chewing gum" heat compound if it's still on there.) If you haven't done all that recently I'd bet you get back something close to the 5 degrees worth of cooling you've lost. :cool:
  • TimTim Southwest PA Icrontian
    edited December 2004
    I just put a new copper heat sink on about 2 weeks ago. Everything inside the case was cleaned out at that time. No pets in my place.

    28 and 49 may be okay at 100% folding, but these are my temps at 1.83 Ghz, and I was running 28 and 47 at 2.20 Ghz with the old power supply.

    And 27 and 44 when it was at 1.83 Ghz with the old supply.

    I sent an email to the tech department at antec.
  • Access_DeniedAccess_Denied tennessee
    edited December 2004
    i think it might of been that the powmax just wasent supplying enough power to MAKE the extra heat and the antec is.. just a thought
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