Inspiron 15 series 5000 CPU's upgrade

While there are versions of this model shipping with quad core CPUs, some considerations:

The CPU is soldered to the system board, so the entire mainboard must be replaced to upgrade.  This has two ramifications:

1.  It's expensive - think upward of 50% of the initial cost of the system, and

2.  It voids any warranty remaining on the system.

With anything but the very highest-end notebooks these days, the CPU isn't upgradeable -- except for a very few remaining high-end workstations and gaming notebooks, socketed CPUs that can be upgraded are a thing of the past.