Yes, you can certainly use up your CPU allocation on an M-10 database (at which point we offer online resizing as large as you want to go, all the way up to 192 CPUs and 1.5TiB RAM). Even still, I've been able to coax more than 10,000 IOPS from an M-10. (Actually, out of dozens of M-10s colocated on the same hardware all hammering away.)
You can get a lot more out of that CPU allocation with the fast I/O of a local NVMe drive than from the slow I/O of an EBS volume.
You can get a lot more out of that CPU allocation with the fast I/O of a local NVMe drive than from the slow I/O of an EBS volume.