32GB of DDR4 doesn’t meaningfully increase power draw.

The difference is usually under 2–3 watts at full load, and at idle it’s basically zero. If you’re building a gaming PC or workstation, the extra capacity won’t cook your system or blow your electric bill.

Power consumption in DDR4 scales with frequency, voltage, and the number of memory ranks, not just total capacity. Two 16GB sticks (Dual Rank) will consume maybe 1–2W more than two 8GB sticks (Single Rank) at the same speed and voltage. A single 32GB stick is roughly equal to a single 16GB stick in power because both are likely dual-rank at that capacity.

For context, your CPU draws 65–150W under load, and a graphics card can pull 200W+. An extra 2W from RAM is noise.

Don’t let power consumption worry you. Buy the capacity you actually need. More RAM usually lets your system do the same work more efficiently, which can save power overall by reducing swap or disk I/O.