db.x2iedn.4xlarge is an Amazon Neptune size with 16 vCPUs, 512 GiB memory (Intel Xeon Family). In US East (N. Virginia) it costs $9.04 per hour on demand ($6,599.20 per month) for Standard storage. It is sold in 9 regions.
Prices by region
USD per hour, Standard storage. Reserved prices are no upfront, standard. Cheapest on-demand first.