Is your board nForce2 so it locks PCI bus speeds?
(I am too lazy to check when you could tell us).
Stock AMD heatsink is not suitable for high o'c, change it or consider running at 1.70V. You might take it off, examine the bottom and lap it then (re)apply very very thin layer of synthetic thermal compound.
Memory, well we have no idea what the ceiling is on your specimens of parts, and that goes for CPU as well. Try 2.7V, 2.8V at most but I think it unnecessary to try pushing past that for an Athlon XP.
Your case temp is too high, but IS it a case temp or are you just blindly recanting a software readout which may easily be calling the temp of a chip with an internal sensor, the system temp? You need actual ambient temp measurement to know the degree rise over ambient of your CPU, so if the system temp is of another chip it only tells you how well that other chip is cooled.
So essentially, figure out if your case follows AMD guidelines, a good unrestricted intake area in front, and likewise good unrestricted exhaust in back from both a 80mm or larger rear chassis exhaust and PSU exhaust. If your case has stamped-in-metal grills for the fans, that is a significant impedance to airflow. Same goes for case front plastic bezel without good intake area, or fan filters no larger than the fan frame (effective use of filters requires filter area about 2-3X+ larger than the fan intake area else very high fan RPM to overcome it, else very low density filter which reduces effectiveness. In short, you have told us little about your specific system to aid in troubleshooting.
67C, if accurate, is too hot for good o'c
Early XP3000 were unlocked, but later only mobile Bartons were. You can take the numbers off your chip and reasearch it if important, but it seems obvious enough that it's locked when bios changes don't work.
So in summary, unless you want to go changing physical parameters of case and 'sink, set the vcore to 1.7V, the memory to 2.7V, and run the system at the highest speed these two will allow, nevermind what you may or may not have used previously. Also keep in mind that the absolute max ceiling o'c any particular board/CPU combo may allow, may go down slightly as the board ages. Ideally one does not o'c to the last % possible but leaves a few % margin so the o'c never needs changed over the life of the system.
Perhaps a better question is why did you have to clear CMOS? It might be important to resolve this, as having to recall and reset o'c every time your CMOS is reset is a PITA if you have to continually do it instead of only once every half-dozen years when the battery wears out.
182 x 13.5 is too high for long-term reliability. You're better off just setting it to about 175 FSB, as a couple of % performance difference just isn't worth the hassle, time, reduced lifespan of motherboard for higher voltage required by higher o'c. Ideally when it's time for you to upgrade again, you will still have a working system to reuse or sell, not be forced into it by the loss of operation of your current system.
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