I built a computer about a month ago and i purchased the DP55WB motherboard and installed 4GB of ram into it and everything worked fine. Recently I bought another stick of the exact same RAM to make 8GB but upon installing it I just get the 3 beep memory error warning. I ensured I had it installed in the correct slot and then upon that being ensured I removed the first stick of RAM and tried installing just the new stick and I got a blue screen. I figured the new RAM was broken or something, so I took it back and exchanged it but still the new stick produces the same result. Both stick are DDR3 OCZ 4GB PC3-10666 RAM. If anyone can help me out it would be greatly appreciated thanks.