Verify if you are using DDR3L ram with 1.35v, not the 1.5v stick.  
Hi I recently bought a 8GB 1600Mhz stick of RAM,     - when i put it alone it does the 1, 3, 2 beeps - when i put alongside with the original stick of ram it is not detected by the bios Any thougs on how to solve this error ?
New RAM not detected optiplex 7010