memory hole remapping: 32bit systems have a boundary limit of 4GB, if you have more, this setting will help your system recognize it.
memclk tristate c3/atlvid: this is related to the energy savings mode, specifically when you suspend to ram, (standby).
bank interleaving: I'm not sure about this one, bit I think it has to do with the way bank rows are refreshed in memory, or the way and order the signal travels to and from them.