6 physical cores are ideal for multiboxing 5 accounts because there is a high level of parallelisation and significant memory access.
The OP, already has a 1366 motherboard and DDR3 ram therefore getting a new motherboard, cpu and memory may not even be cheaper.
Edit: a lot of benchmarks are not designed to take into account multithreaded jobs which is what multiboxing is. Multiboxing has a similar load distribution to video editing, though this is my opinion.
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