Q9550 problem

Hello. I have oced my c2q q9550 to 2.9 Ghz (small oc) through the bios by raising the fsb from 1333 to 1364. I can see the change in the cpu clock and fsb in the bios, but when i log into windows, CPU-Z still reports the original clock speed and doesn't change it. is there something in the bios i should change? there is an option called Intel EIST (if im not mistaken) which is currently disabled. should i leave it like that? There is also an option called "Spread Spectrum" which i left enabled. is that the right decision? thank you
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  1. My advise to you is to read this sticky really good.

    Try to learn it as well as you can. Then apply that knowledge to your set up. If you have questions after that then post your system specs and what you have tried.

    This CPU is not difficult to OC if you know what the parameters related to it mean and how they affect the stability of your CPU/M/BD combination.

    Good luck and happy OC'n.:)
  2. What kind of motherboard?

    GA-EP45-UD3P | Q9550 OC'd to 3.6 GHz (425 MHz X 8.5) C3 stepping :(

    About the only C2Q easier to OC is the Q6600.
  3. Thanks for responses. I have a XFX 750i Motherboard (not a friendly overclocker). I solved the problem mentioned above (had to disable spread spectrum) and read the sticky. I understand that I should try to get a stable boot and then worry about stress testing. However, when I gradually raise my fsb from 1333 to 1363 (Vcore 1.08) and boot into windows, I can't even get 2 minutes of Prime95 before my computer freezes and I have to reset it. I don't understand. My CPU is a good overclocker (E0 stepping). Why wouldn't it overclock by a simple 0.1 Ghz? thanks
  4. Thats a low vcore, why not increase it a notch or two.
  5. Okay i did that increased it to ~1.26 and pushed the fsb up to 1500. Apparently my MoBo has a fsb hole around 1360 - 1450. I also gave the MoBo a whole lot of other voltages like NB, SB, and VTT FSB. I added to all of them until the bios indicated that they are unsafe (by highlighting red). After booting Windows, i was surprised to see that my computer was running stable. After playing 30 mins of GTA IV, (as you all know, a very demanding game) my cpu temps did not go past 45C. If my voltages are high but my temperature is low (thanks to my awesome Corsair H50 watercooling), will that still damage my cpu or mobo? thanks
  6. Best answer
    Q9550 (C1 stepping) @ 3.6GHz with 1.31V Vcore here.

    Runs under full load with decent temps and completely stable.

    This CPU is rated to take 1.36V Vcore so all is good. :)

    I would however suggest you post what all your voltage settings are for the experts to see and also run Prime 95 to check stability for an extended duration. (8-12hrs)
  7. I would not suggest playing with other voltages for the sake of it, the lower the better.
  8. I see. I will try to lower other voltages and see if it's stable
  9. Best answer selected by peyman_tp.
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