There's almost no difference between single and dual channel modes with the AXP. It has a single 64-bit wide DDR CPU bus, so it's evenly matech to a single 64-bit DDR DIMM.
#2 would be a better option.
<font color=blue>Only a place as big as the internet could be home to a hero as big as Crashman!</font color=blue>
<font color=red>Only a place as big as the internet could be home to an ego as large as Crashman's!</font color=red>