I guess it depends on how you are using your phone. If you’re mostly using it between charges (possibly replacing other devices) it indeed doesn’t matter. If you care about standby time, or use it as music player or similar tasks more than active use it does matter.
A 64GB laptop configured with two 32GB DDR4 modules consumes less than 4.6 watts (W) in active mode and less than 1.4W when idle
DDR5 uses about 20% less power, so for 16GB you’re looking at less than 0.3W… likey way less, since a Samsung S24 Ultra with 12GB of RAM claims up to 95 hours “while listening to music”. That’s on a 5000mAh battery, or 18Wh, meaning less than 0.2W for “CPU + 12GB RAM + Bluetooth + storage”.
I guess it depends on how you are using your phone. If you’re mostly using it between charges (possibly replacing other devices) it indeed doesn’t matter. If you care about standby time, or use it as music player or similar tasks more than active use it does matter.
RAM can also enter a low power mode:
DDR5 uses about 20% less power, so for 16GB you’re looking at less than 0.3W… likey way less, since a Samsung S24 Ultra with 12GB of RAM claims up to 95 hours “while listening to music”. That’s on a 5000mAh battery, or 18Wh, meaning less than 0.2W for “CPU + 12GB RAM + Bluetooth + storage”.