nRF52 RAM retention vs RAM Power

Question

I'm trying to figure out the RAM power and RAM retention on the nRF52. This is the micro I've used that has had the ability to turn chunks of RAM on or off. 
 Here's my understanding. Retention and power are 2 separate, but somewhat related options. A RAM block that is powered can be read/written by the CPU. With RAM retention enabled, a RAM block can be powered / not powered without loosing the contents. If RAM retention is not enabled, the contents of the RAM block will be lost when it is powered down. 
 Do I have that right?

Susheel Nuguru · Accepted Answer

RAM rentention will only retain the RAM block contents only in SYSTEMOFF mode. SYSTEMOFF is a deep sleep mode which is different than power down. When system is powered cycled, no matter what the settings for RAM retention are, its contents are lost.