if you're running at a 100MHz FSB and your maximum multiplier is 12.5 then you're running at 1250MHz. To go faster, you'll have to overclock the FSB if your motherboard supports it. If you've got the 133MHz FSB, then you only need a 10x multipler to get 1300 (1330)MHz. And you can max out at 12.5x133=1662.5MHz and that's without overclocking the FSB.
The multiplyer is set on your chip at 13. your motherboard sees this and will run at 1300 with a 100 fsb speed. the only way to overclock is to raise the fsb to whatever you board and system will run at. 105fsbx13=1365 110fsbx13=1430
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okay that makes sense if you've got a processor with a locked multiplier. but what happens if you do the pencil thing to close the L1 bridge. then since his mobo only has up to a 12.5 multiplier setting would he be stuck at 1250 without OCing? hmm, as I write I remember that 'CPU default' is an option and that's probably how you recover the 13x. Am I right?