Pc133 should have no problems at 66 MHz. But you may have a problem getting all of your memory capacity out of PC133 on a chipset that only supports 66 MHz FSB. But at worst you'll only get half of your memory capacity. It'll still work.
As RepoMan suggested, if you have a 440BX, 440LX, 430TX/VX, Via MVP3-4, ALI Alladin 5 or below, which can only recognize up to a maximum of 768 MB's of SDRAM (3 DIMM slots), then a high-density memory module will only be 1/2 recognized by your system.
High density modules (32xblah blah) are double the density of older modules (16xblah blah) and are only 50% recognized by the aforementioned chipsets.
To run at PC66, the SDRAM will automatically re-configure itself for operation at that speed. PC133 simply means that it will run UP TO a maximum of 133 MHz.
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