Hi, I just had a family member buy some ram for their notebook, and for some reason it doesnt like it. The laptop is an Ibm thinkpad 600x. The ram purchased was 256mb pc133 sodimm 32x64-74 144-pin. I dont get why it wouldnt work as the thinkpad uses pc100, but the pc133 should scale back right? Im also not sure, but maybe it has to do with the density, i dont know what the thinkpad uses, nor if the ram purchased was high or low density, anyone have any ideas?