It is true that with the 933 you will be technically overclocking the memory to 133Mhz. I can attest that all of my Crucial PC100 sticks that I have bought in the past were able to run at PC133 speeds. It could not hurt to try. Also, depending in your motherboard, I know some of them were able to run the memory at Host Clock-PCI bus speed. With at 933 PIII, that would be 133-33=100Mhz. You didn't mention what motherboard you are using so I can not give a definite answer as to whether your motherboard supports that option, but it is worth looking into. I will say that for best performance, you will definitely want to try running your memory at 133 as it will yield better performance.
Geoff