Unstable overclocking with my Pentium M

evolucion8

Platinum Member
Jun 17, 2005
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Hi, I bought this two sticks (1GB Each) Crucial Ballistix Tracer PC4000 to overclock my old P4 EE 3.4GHz, but then I changed my mind and put a Pentium M with the Asus CT-479 adapter on an Asus P4P800-E Deluxe, at stock everything works fine. But once I overclock the system, no matter what timings, voltage or PAT Settings, I can't never make it any stable, it won't pass Prime95 no matter what.

It would boot at 2.6GHz fine, but once I started video ripping or Prime95 it would reboot, it's a Pentium M 780 2.26GHz with 533MHz FSB. The voltage values doesn't work the way it supposed to, probably is the adapter itself. I can't reboot at default Vcore, or at 1.48V, it must go at least 1.55 which seems high to me, but probably is not at that VCore speed even though programs like Everest shows the same value in real time.

The CPU temperature will not exceed the 75C in the worst case scenario (The thermal envelope for this CPU is 100C). Is the adapter or mobo holding me back?? Sheesh.

Update: I increased the VCore at 1.6V and tested with Prime95 with the CPU at 2.53GHz and lasted 20 minutes. Before the increase in the VCore, it used to reboot in less than 5 minutes, so am I in the right way to find the sweet spot?? Currently testing at 2.50GHz. I know that Prime 95 is one of the most stressfull apps for the CPU, but my question now is the following. If the Prime95 test makes the system reboot, can that also happen during normal user usage? After all most current consumer apps doesn't torture the CPU the way that Prime95 do.
 

zach0624

Senior member
Jul 13, 2007
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You are on the right track and as far as I know the pentium Ms take at least the voltage of a desktop c2d(atleast mine does underload, 1.7ghz) so to OC that is probably a fine voltage, you can probably increase it more to get that OC stable. Also at 150 mhz fsb I would expect it to take that much volts. You should have plenty of room to OC (also because that is the fastest pentium m it may be close to the architecture's limit, so to get a jump in speed you may have to feed it a lot of juice.
 

evolucion8

Platinum Member
Jun 17, 2005
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At 2.50GHz, it took 25 more minutes to crash than when it was at 2.53GHz, seems that the sweet spot would be between 2.40 and 2.46GHz. But I play lots of games, encode movies etc, and don't have any issues, weird.