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  • #1

    MSI 745 Users, Take Notice!

    Ok, so after a year of owning this board/chip combo (MSI 745 and Athlon XP 1800+), on the eve of getting rid of it, I've FINALLY found the cause of the "doesn't want to stay at 133(266)Mhz FSB" problems.

    Are you ready for this? You're gonna love it.

    ...

    ...

    ...

    ...

    The fan. Yeah, this board apparently has a problem with the fan. It's picky about the information it's getting from the CPU fan, and if it doesn't get the right information, it won't boot. HOW ****ED UP IS THAT?

    I mean, here's the deal:

    It was running fine at 133, with my Volcano 9. I pull the Volcano 9, and slap on a smaller, quieter HSF.

    Oops... won't come up. Diagnostic LED's say it's hanging on memory detection. Huh???

    So I try different BIOSes, clearing the BIOS, everything. Nothing helps, it just won't go to 133!

    So I think maybe it's heat... slap the Volcano back on and it works.

    ARGH!

    Then I notice something. The Volcano has a regular fan lead... which is plugged into a splitter. Red and black go to a regular molex +5V plug, and yellow goes to the CPU fan header.

    Then it hits me - that's the secret. So I take the Volcano out, slap the other fan back on, but this time using the jumper plug... and it works. Flawlessly.

    ARGH!

    - Gurm
    The Internet - where men are men, women are men, and teenage girls are FBI agents!

    I'm the least you could do
    If only life were as easy as you
    I'm the least you could do, oh yeah
    If only life were as easy as you
    I would still get screwed
    Tags: None
  • #2
    Hmmm. I'm running my Volcano off the MB. I can't wait to get home and see if this fixes my weird little problem.
    Gigabyte P35-DS3L with a Q6600, 2GB Kingston HyperX (after *3* bad pairs of Crucial Ballistix 1066), Galaxy 8800GT 512MB, SB X-Fi, some drives, and a Dell 2005fpw. Running WinXP.

    Comment

    • #3
      gurm, nothing new there.

      happened with my system too. do you know how I found the problem?

      I read the error message.

      it popped up while posting (system fan error or failing or something along the line).

      mfg
      wulfman
      "Perhaps they communicate by changing colour? Like those sea creatures .."
      "Lobsters?"
      "Really? I didn't know they did that."
      "Oh yes, red means help!"

      Comment

      • #4
        While asking the obvious, is there an option for "CPU Protect if fan fail" or some such engrish?

        Comment

        • #5
          Fan detect is toggleable
          If there's artificial intelligence, there's bound to be some artificial stupidity.

          Jeremy Clarkson "806 brake horsepower..and that on that limp wrist faerie liquid the Americans call petrol, if you run it on the more explosive jungle juice we have in Europe you'd be getting 850 brake horsepower..."

          Comment

          • #6
            I was going to say - I have run it fine with no fan on at all (watercooling). When booting it will say "CPU Fan Fail" or something similar and ask you if you want to continue booting.

            You can though turn the checking off in the BIOS - then it boots without testing for the fan.

            This IIRC was using BIOS v1.6

            So it may have been that something else with the fan was causing problems here...
            DM says: Crunch with Matrox Users@ClimatePrediction.net

            Comment

            • #7
              Erm, yeah actually I found that spot. I'll have to try turning it off, hadn't even thought of that! D'oh!

              (Just didn't know that's what it was for!)

              But seriously, I wonder what exactly they're checking?

              And you'd think it would do something more sensible than just hanging on the memory detect phase!

              - Gurm
              The Internet - where men are men, women are men, and teenage girls are FBI agents!

              I'm the least you could do
              If only life were as easy as you
              I'm the least you could do, oh yeah
              If only life were as easy as you
              I would still get screwed

              Comment

              • #8
                It's probably just an "idiot proofing" feature, to help keep someone from powering up the system without a working CPU heatsink and/or fan.

                Comment

                • #9
                  Yah. But why does it think that my fan is just fine for 100Mhz, but not for 133Mhz?

                  That's what drives me nutty. That's what made it so hard to pin down!

                  - Gurm
                  The Internet - where men are men, women are men, and teenage girls are FBI agents!

                  I'm the least you could do
                  If only life were as easy as you
                  I'm the least you could do, oh yeah
                  If only life were as easy as you
                  I would still get screwed

                  Comment

                  • #10
                    It divides the fan speed through memory bus speed?

                    AZ
                    There's an Opera in my macbook.

                    Comment

                    • #11
                      Seriously, it must!

                      But honestly, I just don't know. I mean, the yellow wire is speed - and that wire goes to the same header regardless.

                      The only thing DIFFERENT right now is that I'm using the black & red wires (ground/+5v) from a molex instead of from the fan header.

                      Is the fan header not powerful enough, or something? It's tres bizarre.
                      The Internet - where men are men, women are men, and teenage girls are FBI agents!

                      I'm the least you could do
                      If only life were as easy as you
                      I'm the least you could do, oh yeah
                      If only life were as easy as you
                      I would still get screwed

                      Comment

                      • #12
                        It could be that the fan is introducing enough noise, or enough power drain, to disrupt the motherboard. I've seen it before on other motherboard/PS combinations, but usually running the CPU fan, but not case fan, off the MB was okay. Taking the case fan off of the MB header allowed me to overclock further (might have been on my 6167).
                        Gigabyte P35-DS3L with a Q6600, 2GB Kingston HyperX (after *3* bad pairs of Crucial Ballistix 1066), Galaxy 8800GT 512MB, SB X-Fi, some drives, and a Dell 2005fpw. Running WinXP.

                        Comment

                        • #13
                          I've got a 60mm Delta finger slicer 6800 rpm fan on my PAL6035 that's got a third lead that doesn't appear to be for speed sensing, or at least not in a format that can be used by the motherboard header. And yes, I'm using an 3 pin -> Molex+RPM sense adaptor... it'd probably melt the motherboard down if I tried to use it directly off the header.

                          Comment

                          • #14
                            Yeah I'm beginning to suspect (after reading some resources on the InterWeb) that ALL the motherboard headers tend to get their power from a single somewhat under-watted line.

                            - Gurm
                            The Internet - where men are men, women are men, and teenage girls are FBI agents!

                            I'm the least you could do
                            If only life were as easy as you
                            I'm the least you could do, oh yeah
                            If only life were as easy as you
                            I would still get screwed

                            Comment

                            • #15
                              btw, does the msi 745 use the temp-diode of the cpu to determine the temperature?

                              mfg
                              wulfman
                              "Perhaps they communicate by changing colour? Like those sea creatures .."
                              "Lobsters?"
                              "Really? I didn't know they did that."
                              "Oh yes, red means help!"

                              Comment

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