This configuration would not be overloaded. We have a DL380 w 64GB RAM on 700+ clients and only used about 10 GB RAM. I must say the db80 is much more scalable and uses less memory than db40....
From your information it's not clear whether the CM is also the MA - for throughput you better look at the MA instead.
From your information it's not clear whether the CM is also the MA - for throughput you better look at the MA instead.