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I'm not in sales, but I believe the smallest number of cores you can purchase is 8 with add-ons of 4-cores a piece. I would suggest contacting your sales rep for exact pricing. That being said, I would not recommend this configuration. While you could likely configure your layout in the above manner, a 4-core primary server does not meet the minimum recommended system requirements for a production installation. Additionally, adding a 2-core worker would likely reduce overall performance since you would be introducing latency with very minimal processing power. It would perform much better to have a single, 8-core computer running as a single-node.
Hope this helps!
Thank You Nathan Panuco. It helps. Will do as suggested.