I've tried pretty much every combination and it looks like you can squeeze the most power out of single core North Europe machines.  I am getting around 19 c/m out of them.  Same virtual servers in the other regions yield about 14 c/m for me.

4 core gives about 49 c/m and 8 core is about 92 c/m.

Single core in North Europe is the way to go if you don't mind wasting some time on setup.


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