But even at 245Hz-250Hz, the system's very unstable, and sometimes fails to boot. I'm sure it's just because I'm missing something, but what is it???
Did you bump vCore?
no, you are just stupid and are trying to push your system too high- idiot
ok, he expects to get 2.7 out of his system when hes probably not supporting right volatges, etc, how is this an 'immature post'
its the truth
1. 2.7Ghz isnt unattainable, hell, 3Ghz on air isnt absurd
2. If you looked into the product specs before making your post, you'd realize that motherboard kicks ass for overclocking ... which ... in case im being too subtle, means that numerous vCore options are available.
3. Not to be your english teacher or anything, but "he" wouldnt be supporting any voltages ... the CPU and MOBO would be ... which, well, if you read up on the parts, you'd realize, they do, in fact, support those voltages
Edit: I thought the AGP lock was automatic on this board? It's certainly set at 66, so wouldn't that do it?
The board should have AGP locked out. (also, did you update your BIOS?

)
Apparently using the first two SATA ports actually overrides any PCI/AGP lock that I put on. So even though the lock was saying active in the bios, it didn't really matter.
Use the other SATA connects, one pair isnt locked, the rest are
I thought setting the AGP to 66 automatically set the PCI to 33.
Correct
I can't find any option to raise the chipset voltage on my mobo
Since you'd lowered your LDT multiplier, you shouldnt have to worry about this (not to mention that board doesnt give you chipset voltage options)
The question is, any idea why when at stock speeds the memory is fine, at an underclock of FSB250/Div.133 it fails to boot, but at a bigger underclock of FSB265/Div.100 it boots perfectly???
When OCing the CPU, the CPU can be "wierd" and since the memory controller is on-die, then its possible that OCing it will produce "wierd results"