CPU Intel Xeon - Enterprise Grade

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CPU Intel Xeon E3 CPU Version 3
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CPU Intel Xeon E5 V3 CPU (2015)
CPU Intel Xeon E5 V4 CPU (2016)
CPU Intel Xeon Gold

What is the difference between a Windows / Dos / Ubuntu Laptop ? Which One Should I Buy ?

Windows, Dos or Ubuntu are basically operating systems, software part of the laptop. It is just that Genuine Windows Come at a Price ( say around Rs.5000) So Laptops with Windows Pre-loaded are a few thousands more expensive than the laptops which do not come with windows pre-loaded.