You have to be careful. I worked for a company that was replacing older servers. The new servers were producing results slower than the older servers. It turned out the server engineering team was turning on energy saver mode, and the processors were running slower than the older processors. We were paying a fortune for SQL Server per processor licenses, and they were trying to save money on the electricity bill.
Also, if you are using VMWare, it can be very difficult to know the speeds you are actually getting, especially if you have different sized nodes in your VMWare cluster.
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