I ordered a 1GB 533 MHz (PC4200) memory module from ShopBySytem an authorized reseller for Gateway Computer. What I received was a 1 GB 667MHz (PC5300) memory module. The PC5300 would work in my computer but only if it was the only module in the macine. It would not work when combined with the two existing PC4200 modules which was of no value to me as I had wanted a totla of 3 GBs. The importer of the Chinese-made module, Crucial, was called to determine any known problems and they told me the PC4200 was no longer available and they were aware... read full review »