Hi. I own a Dell Precision Tower 5810 that I would like to upgrade. It currently has an Intel Xeon CPU E5-2603 v3 for the CPU. What are my upgrade options for this? Can I put an i3 or i5 in it? I’m a total noob when it comes to this stuff so I apologize. 

For the GPU, it currently has an Nvidia Geforce GT 640. I’d like to upgrade it to a GTX 1050TI. Will that card work and be compatible?

Thank you very much.