p5k, e6750, ninja fan, only 400fsb clock possible?

Hey all!

I got my new computer this weekend
(asus p5k, e6750, ninja plus rev. b fan, 4gb corsair pc6400 4-4-4-12 at 2.1v, samsung spinpoint hdd 400gb, all stuffed into my antec p182 case, all fan on 1200rpm. Corsair HX 520W). I've been trying to overclock it with the help of http://forums.hexus.net/showthread.php?t=103676, http://forums.hexus.net/showthread.php?t=110267 and http://www.tomshardware.co.uk/forum/240001-11-howto-overclock-quads-duals-guide.

I can run prime blend test for 6h at 400mhz front bus. tried a large fft test at 410, fail after 4 hours. Temperatures never exceed 46C degrees. MB temp is ~35C. I run speedfan, coretemp and asus pc probe 2 in windows vista 32bit (installing 64bit next week so I can use all the ram).

Voltages in bios is set to auto (except ram). Is that ok? Do I manually need to raise the voltages or should I only start messing with it after I found my max stable overclock so I can try to reduce it?

Oh yeah. CPU is G0 revision.

Any help is welcome
13 answers Last reply
More about e6750 ninja 400fsb clock possible
  1. hmm, and just now I got an alarm in asus probe about vcore vent to 0v and up to 1.4v.. what is that about?
  2. Auto voltages are ok until you're ready to set them up manually.

    Disregard asus probe. The only cause for alert/concern is BSOD or instant restart by itself due to overheating, as long as your max cpu temp is within specs.
  3. thanks for reply!

    So I don't need to worry about failure in prime either?
  4. What memory multiplier and ram frequency are you at? Have you tried running Prime95 at 5-5-5-15? That is where I would start.
  5. It's Corsair TWIN2X 6400C4, which has default settings at 4-4-4-12. Which means I havn't clocked the memory yet...

    What about the errors in prime? Should I run test until BSOD/reboot or should I lower the fsb when I recieve error in prime?
  6. Set memory to 5-5-5-15 with a x2 memory multiplier @400 MHz then run Prime95.
  7. no improvement
  8. Does prime give errors when the pc is at stock?
  9. I ran 6h blend test at 400fsb with no error, longest I've tried. Havn't been able to try lately due to lots of work to do. I can try a longer test today (at 400fsb), large FFT, as it seems they often stop the test.
  10. ran a 8hour test without fail 400fsb. What's wrong with higher clockrates?

    Btw, anyone know how I can silence the graphic card (fan) when I'm not playing games?
  11. If you've mentioned what CPU multiplier you're using I can't find it.

    To lower GPU fan speeds download a program called Rivatuner.
  12. I'm running with 8x multiplier (max).

    Does vista 64bit mess things up? I can't run core temp since i installed vista 64bit.

    What does the errors mean in prime? Should I ignore them and just oc until I crash?
  13. I don't know if you can ignore the errors or not. When I get errors I fix it- that's how I roll, and it's what I recommend you to do for the sake of your investment. It's possible that Vista could have a hand in it, I dunno. 3.2 is a decent jump from stock speeds though and your system probably just needs a boost in voltages somewhere.

    We've established that your system runs fine at stock speeds, and we've eliminated memory as the culprit here. I would raise North Bridge voltage in the smallest increments allowed. It's probably going to be somewhat time consuming, but start at the lowest voltage available when leaving auto and work your way up until you achieve stability.

    BTW this is a little guide using an ASUS board that you might find helpful. http://www.digital-daily.com/motherboard/asus_p5b_deluxe_wifi/index05.htm

    If you fix the problem please chime in and let us know what worked.
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