Ummmm... Corruption of the OS can be caused by MANY other things; the same goes for BSODs. If one of the two sticks is faulty, then yes, there is a chance of getting a BSOD. However, even if you only have one stick of RAM in your computer, there is still a chance of getting a BSOD if the RAM is faulty. I have four sticks of RAM in my home server (each one being 128MB) and it has never crashed on me; not a single BSOD. Motherboard manufacturers put more than one RAM slot on their boards for a reason: to upgrade! Where are you getting this information from? Let me clarify. After I added another 256 MB DDR SDRAM modules with the FSB at 133 mhz and the RAM timings at 2.5-3-3-7, which is a standard setting, to my trusty Asus A7V8X-X motherboard, which I gave to someone. It seemed to be fine when I was configuring Windows XP Pro SP2 with it. But days later, the owner complained about it repeatedly rebooting at the Windows XP logo! Despite the above problem, Memtest 86 passed at least some loops. I didn't have the time to run Memtest86 for longer! I never gotten another complaint after removing that 256 MB RAM module then restored an image that I made. The issue is more likely to occur with newer motherboards. It seems that the memory controller gets strained or a VRM issue with newer motherboards. That's despite they are made to be able to run at 133 mhz. Thus, I'm puzzled, because I wasn't expecting Windows to throw a fit, because it wasn't even overclocked one little bit!