Processing on 1000messages by socket

I need a suggestion on server setup. I am using java web socket and it will have to send 1000messaegs/sec to its connected users. Basically, 100 users will be connected to endpoint and each user will own a thread at server. Means 100 threads and each thread will send 10messages/sec i.e 1000messages/sec

Can you help me which specification of the Amazon AWS server can handle it?

Thanks