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I'm assuming that your FSB at 2.7GHz is 150. If so, then there's a couple factors that could be affecting your overclock.
You mentioned the PCI/AGP cannot be locked. Well, running some devices out of PCI spec (hard disks, expansion cards), even a tiny bit, could cause you problems. I'm not extremely familiar with the P4X400 chipset, but if it doesn't have the proper divisor for the PCI/AGP busses, then you're going to be overclocking them as well, and something on either of those busses may not like it that much. If that's the case, then you're probably at the limit of your overclock. You might want to see if juicing up the video card helps out any with the AGP bus, but from what I've seen in the past, the hard-disks tend to get fudgy first.
You say your memory is good, what speed is it? Need more info on this before I can rule that out as a possible culprit.
Also, if the chipset doesn't support anything higher than the 533MHz FSB P4's, then there's also a chance that the chipset could have hit it's limits for the CPU host clock. You might (if you haven't already) try upping the VCore of the CPU, and seeing where that gets you. If it doesn't help, then I'm thinkin that you're only gonna get to 2.7 (which still isn't a bad overclock, for a 533MHz FSB P4).
Hope some of this helps.
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