It's highly unlikely that jamming twenty 64-bit game clients onto six CPU cores is going to be an enjoyable experience, especially when the base clock of the 8400 is only 2.8GHz. Unfortunately, "20-man multiboxing" and "budget" don't normally fall into the same sentence.
However, if you're using multiboxing software that is capable of running from two different machines, then you could always try and split the load between them.
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