I have a 512MB stick of ram in my computer. It's DDR SDRAM with a speed of 400Mhz (PC3200), and it's PNY Optima Brand. I'm only able to push 266Mhz on my CPU so it was just a I'll have it for the future thing. My Uncle gave me a 256MB DDR SDRAM stick of Kingston 266Mhz (PC2100). My question is, when I put both sticks in, only the 400Mhz is being read and I can't change the speed of the ram. On DXDIAG it only shows 512MB of Ram. I can see a significant speed boost when I put the 256MB in, but after an hour I recieve a blue screen because win32k.sys has failed, is there a way to fix this so it reads the other stick and runs fully operational.