Hello and welcome to the forums What is BIOS reporting ? if its set at auto then set the timings manually.
However something like this happened to me before,i had ASUS P5K-E WIFI motherboard with 4GB DDR2 800 RAM with 4-4-4-15 timings,and in BIOS the timings were 4-4-4-15 but CPU-Z was showing that i have a DDR3 RAM with 7-7-7-20 timings,so there wasn't a problem with my hardware,there was a bug with CPU-Z because my setup worked flawlessly