Weird 240 ohm resistor on zq line to DDR
Because these DDR's have merged drivers and on-chip termination they have an active termination calibration circuitry and procedure.  The calibration resistor should be accurate , thus the 1% selection.

Note that this resistor can be shared amongst die if the controller sequences properly. Look at this app note from Micron (opens a PDF) concerning the calibration "DDR3 ZQ Calibration".

The dot ... see this EE.SE post



From that data sheet.