I am sure there is, but I am not sure what it is. All I can tell you is the disks are fast :) DigitalOcean gives you a fair share of the physical node’s resources. Just don’t abuse them as you are not allowed to “… [employ] programs that consume excessive network capacity, CPU cycles, or disk IO” (ToS 12.1).

Here’s an interesting benchmark someone did: https://dzone.com/articles/iops-benchmarking-disk-io-aws-vs-digitalocean

Result: (Random Read / Write)
Digital Ocean

Digital Ocean’s SSD performing ‘33215’ read operations per second and ‘11093’ write operations per second
The test got completed in ~30 seconds

AWS

AWS’ SSD performing ‘2257’ read operations per second and ‘752’ write operations per second
The test got completed in ~5 mins

Obviously for max performance in AWS you need to have provisioned IOPS which comes at a cost (the above test results was general SSD). Digital Ocean I imagine give you greater IOPS because it’s easier to setup the SSD based on the VPS plan you’ve chosen. AWS is 100% customisable.

If they don’t announce an upper limit then it probably means you’ve got dedicated SSDs with your VPS plan and you’re free to “abuse” it as much as you like because it’s not affecting anyone else.