I can't imagine the iphone is entirely powering down memory. Otherwise just unallocating memory won't change the power consumption.

Those aren’t the only two possibilities though.

	▲	mort96 4 hours ago \| parent \| next [-]
		What other possibility are there? By what mechanism are you suggesting that iPhones save power by keeping RAM usage low?
	▲	LtWorf 4 hours ago \| parent \| prev [-]
		Do you have any source that the iphone is turning RAM on and off?