When a custom part is build based off of the MT41K512M8THD-15E TwinDie part, the "Memory Details" at the bottom of the GUI do not double the density for the second rank.
The built-in MT41K512M8THD-15E part does show the correct 4Gb density.
However, if a custom part is built using this 4Gb Twin Die part as the "Base Part" without any changes, the density of the custom part is only shown as 2Gb.
This issue can be safely ignored as the design is correctly generated for 4Gb parts.
06/05/2014 - Initial Release