can my dell inspiron 15 (5558) i3 processor be upgraded to an i5?

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No. That is a BGA cpu, meaning it is soldered to the motherboard and cannot be replaced without extensive skill and very specialized equipment. In essence, not at all. There are no provisions for replacement of BGA processors. When one fails, generally the entire motherboard is replaced. You might be able to find a used Inspiron 15 motherboard that came with an i5, but the cost would probably exceed what you could just buy a better laptop than it would be even WITH that i5.

This is by design. They generally want you to upgrade the whole unit, not it's parts.
No. That is a BGA cpu, meaning it is soldered to the motherboard and cannot be replaced without extensive skill and very specialized equipment. In essence, not at all. There are no provisions for replacement of BGA processors. When one fails, generally the entire motherboard is replaced. You might be able to find a used Inspiron 15 motherboard that came with an i5, but the cost would probably exceed what you could just buy a better laptop than it would be even WITH that i5.

This is by design. They generally want you to upgrade the whole unit, not it's parts.
 
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