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Thread: When I put the FSB up, the CPU clock goes down?

  1. #1
    Oh right, Ted koocha's Avatar
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    When I put the FSB up, the CPU clock goes down?

    Hi

    I've got an opteron 165. At the moment it's running at stock speeds because when I put the FSB up, the clock speed goes down and I can't understand why.

    At the mo it's running at 1800Mhz (200 x 9). If I put the FSB up and change nothing else, say to 245Mhz (245 x 9 should be 2205Mhz) but in reality it changed it to 1200Mhz (Confirmed by CPUZ and PC Wizard).

    I'm running it on an Asus A8N-SLI SE. Could it be something to do with me having 4 sticks of RAM in it?

    Any help would be appreciated.

    Thanks

  2. #2
    not posting kempez's Avatar
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    Have you set the 4 sticks to run @ 2T?? (CPC to disable)

    Have you manually set the divider in the BIOS and set CoolnQuiet and CPU Thermal Throttling to off?
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    Resident abit mourner BUFF's Avatar
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    Sounds like Cool'n'Quiet kicking in?

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    Oh right, Ted koocha's Avatar
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      • Motherboard:
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      • CPU:
      • Intel Xeon W3656
      • Memory:
      • 12GB Triple Channel DDR3
      • Storage:
      • 512GB Crucial MX100 SSD, 3 x 3TB mechanicals
      • Graphics card(s):
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      • PSU:
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    Hey

    Cool'n'Quiet is set to off.

    What do you mean about 2T and CPC? The RAM timings?

    I didn't manually set the multiplier...i thought it was locked at 9x
    Last edited by koocha; 11-03-2006 at 12:34 AM.

  5. #5
    Senior Amoeba iranu's Avatar
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    I had an issue with my bro's 146 on an asus MR8-MVP (?) where upping the fsb would down the multiplyer. I believe it's because the motherboard does not lower the LDT or HTT multi.

    eg. FSB = 200 CPU, Multi = 9, LDT or HTT Multi =5x, therefore

    cpu speed = 1800Mhz, HTT speed = 5x200 = 1000

    Now alot of motherboards do not like it when the HTT speed goes over 1000 so you need to drop the LDTor HTT Multi to a safer value liike 3x when upping the FSB.

    so for your setup

    manually change the LDT or HTT Multi to 3
    manually set your CPU Multi to 9
    up FSB steadily

    so at a FSB of 245 you will have a CPU speed = 9x245 = 2205 and an HTT speed = 3x245 = 735

    I would also advise you to put your ram on a divider to start with so the FSB is greater than 200 but your ram runs at 200. Iirc Asus have a % value for the FSB/Mem divider so try something like 4/5 (80%) to start with.
    "Reality is what it is, not what you want it to be." Frank Zappa. ----------- "The invisible and the non-existent look very much alike." Huang Po.----------- "A drowsy line of wasted time bathes my open mind", - Ride.

  6. #6
    Oh right, Ted koocha's Avatar
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      • CPU:
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      • Memory:
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    Right, I've set it up as follows:

    HTT = 3x
    FSB 240Mhz
    Multiplier = 9x
    RAM = 333Mhz
    PCI = 33.33Mhz
    Core Voltage = default

    and I've got it to 2160Mhz.

    As soon as I try 245Mhz FSB it won't post. Does the first bit when it's detecting the hard drives and what not, but not the second bit with the table at the top and the hard drive sizes, cache, etc.

    Should I increase the core voltage? I've got a Freezer 64 Pro strapped to my Opteron and it runs at 34 degrees load

  7. #7
    Senior Amoeba iranu's Avatar
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    Try dropping the ram to a lower divider so as to ensure that it is taken out of the equation. So use a setting of say 50%. You can always increase this later.

    See if the booting problem is the same. If it is it will mean that your chip has reached it's limit with the default voltage. So now up the voltage to the next increment/setting and reboot. Keep an eye on your cpu's temperature - you can do this in the bios. Run some benchmarks to ensure that the cpu/machine is stable.

    45C is no problem under load for these chips. Post back with results including voltage
    "Reality is what it is, not what you want it to be." Frank Zappa. ----------- "The invisible and the non-existent look very much alike." Huang Po.----------- "A drowsy line of wasted time bathes my open mind", - Ride.

  8. #8
    Oh right, Ted koocha's Avatar
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    • koocha's system
      • Motherboard:
      • Fujitsu D2778-c1
      • CPU:
      • Intel Xeon W3656
      • Memory:
      • 12GB Triple Channel DDR3
      • Storage:
      • 512GB Crucial MX100 SSD, 3 x 3TB mechanicals
      • Graphics card(s):
      • 2GB NVIDIA GeForce GTX680
      • PSU:
      • 500w Fujitsu
      • Case:
      • Fujitsu M470-2
      • Operating System:
      • Windows 10 Pro
      • Monitor(s):
      • 42" LG Smart 3D TV
      • Internet:
      • 76Mb BT Infinity 2
    Looks like it was the RAM being a gimp. I put it down to 200Mhz and now the FSB is up to 255Mhz

    I'm running 2 different types of RAM in it:




    These are Twinmos PC3700

  9. #9
    Oh right, Ted koocha's Avatar
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    • koocha's system
      • Motherboard:
      • Fujitsu D2778-c1
      • CPU:
      • Intel Xeon W3656
      • Memory:
      • 12GB Triple Channel DDR3
      • Storage:
      • 512GB Crucial MX100 SSD, 3 x 3TB mechanicals
      • Graphics card(s):
      • 2GB NVIDIA GeForce GTX680
      • PSU:
      • 500w Fujitsu
      • Case:
      • Fujitsu M470-2
      • Operating System:
      • Windows 10 Pro
      • Monitor(s):
      • 42" LG Smart 3D TV
      • Internet:
      • 76Mb BT Infinity 2
    UPDATE:

    Got the FSB up to 275Mhz and the RAM to 266Mhz and all seems stable at the mo. Going to run prime95 at some point to check

  10. #10
    Oh right, Ted koocha's Avatar
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    • koocha's system
      • Motherboard:
      • Fujitsu D2778-c1
      • CPU:
      • Intel Xeon W3656
      • Memory:
      • 12GB Triple Channel DDR3
      • Storage:
      • 512GB Crucial MX100 SSD, 3 x 3TB mechanicals
      • Graphics card(s):
      • 2GB NVIDIA GeForce GTX680
      • PSU:
      • 500w Fujitsu
      • Case:
      • Fujitsu M470-2
      • Operating System:
      • Windows 10 Pro
      • Monitor(s):
      • 42" LG Smart 3D TV
      • Internet:
      • 76Mb BT Infinity 2
    EXTRA UPDATE:

    Got the FSB to 285Mhz and the RAM to 266Mhz. Running like a little, beautiful beast

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