There was a time when you could upgrade cpu on a laptop... : r/pcmasterrace
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Dell Precision M4800 Upgrade Price List
Refurbished: Dell Precision M4800 Workstation 15.6" Full HD 1920 x 1080 Resolution Laptop - Intel Quad Core i7-4800MQ 16GB RAM 256 GB SSD + 1TB SSD WebCam WiFI DVDRW Windows 10 Professional
Amazon.com: New 4GB Graphics Video Card GPU Upgrade Replacement, for Dell Precision M7520 M7510 M4800 HP ZBook 15 G3 G4 Workstation Laptop, Nvidia Quadro M1200, MXM VGA Board Repair Parts : Electronics