[RESOLVED] PII Speed Verification

Okay, I've been running my current setup for a good 6 months now and just yesterday o/c'ed my PII 300 to 450. What I don't get is that the PII300 (SL2W8, Costa Rica, 39th week, 1998) isn't suposed to achieve the 100Mhz bus without the B21 (I think that's right) pin covered. I did not do this yet still achieved 4.5x100 (checked it in WCPUID as well). Any ideas on this? Could it be I had a 450 all along and it was underclocked due to a simple jumper error? I don't know the speed of this PII because it just came with the P2B mobo that I bought off a friend. I appreciate the help, thanks.