No they don't. The KT133 has a FSB of 100, plain and simple. The KT133a has 100/133. They're double-pumped, so although the CPU is talking to the Northbridge that fast, it's not really the bus speed.
<font color=blue>Quarter pounder inside</font color=blue>
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<font color=blue>Quarter pounder inside</font color=blue>
<font color=red>Change the Sig of the Week!!!</font color=red>