you can oc the 2180 to 3.0-3.3ish, so at that speed, it won't be much of a bottleneck, if any.
the 5200 can get close to 4.0ghz, so definitely no bottleneck there. this all depends, however, on you having adequate hardware for an overclock
at stock speeds, the 2180 will definitely slow you down, while the 5200 might be ok