I bought a new Mac Book 15inch Retina Display with 8 GB RAM for ₹1,50,000. My System Info shows the Processor name as Intel Core i7 and number of cores as 4. See attached picture for details. The new machine was performing very slowly and so I took it to the authorised Apple Dealer in Kolkata. The technician connected my MacBook to the Apple server using the Apple Service Toolkit. After that, the hardware specs show says that my Processor name is dual-core Intel Core i7. See attached picture for details. Now I am confused. Is my processor not being detected properly or have I been cheated into buying a Dual Core machine advertised as Quad Core? Please advise.