db.r6i.12xlarge is an Amazon Neptune size with 48 vCPUs, 384 GiB memory (Intel Xeon Family). In US East (N. Virginia) it costs $8.352 per hour on demand ($6,096.96 per month) for Standard storage. It is sold in 29 regions.
Prices by region
USD per hour, Standard storage. Reserved prices are no upfront, standard. Cheapest on-demand first.