I bought and installed a 333MHz 1GB RAM to upgrade the memory of my 4 year old laptop. It was booting okay, but soon after starting firefox or any video in either Windows or Ubuntu, it used to freeze. I ran Windows Memory Diagnostics, and it consistently told me of Stride6 error, Cache on. Now does this mean that the RAM I bought is bad, and I should ask for a replacement, or are the settings or the RAM itself incompatible with my laptop in some way?