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Installed 512MB PC133 and now machine locks up. What type of RAM does this machine use?

I have an Apple Powerpc 750 that I am trying to upgrade the RAM.  The serial number is UV33913DPBN and I installed PC133 512MB.  The laptop called for PC133.  Now it locks up and scrolls on its own sometimes.  Can someone please let me know if that RAM is compatible with this PC and if so why would it be doing that? If it is not what type of RAM should I use and what size is the max?  Thanks in advance!!
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pheidius

Your description need more detail as the powerpc 750 was a chipset that was placed im many g3 products. As you mention laptop we need to know which model laptop? What is the family model? It would not hurt to know your os either.
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I thought the model was the PowerPC 750, behind the powerpc 750 is (2.3).  Maybe i am mistaken about that being the model.  I am not sure the version of OS as I do not have the machine with me righ tnow.  Can someone tell me if their is a difference in RAM for a windows based machine and an apple?  
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Apple machines have always demanded a higher quality memory than the pc counterparts.

I bought 2x 1GB sticks of RAM, only one of them would work in my Mac Mini, the other worked fine in my PC.

PowerPC 750 refers to the type of processor in your laptop.  This is a G3 processor.
If you can find out when the laptop was made or what speed it runs at then you will have an easier time trying to identify it.
So what is the family number?