will this work in a toshiba satellite c850-st2n01?

Hello That model laptop is listed to supports up to 16gb of DDR3 SODIMM ram up to 1600

will this work with a SONY VAIO SVE14125CXB laptop?

You would have to look at your manufacturer's website for that info. Every laptop has different specs. You will need your motherboard and Ram specs.

Hello, Thank you for contacting us in regards to your question. This memory is within spec for the listed laptop. Thank you, Newegg Support

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Specs

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Model
Brand	SAMSUNG
Model	M471B5273DH0-CK0

Additional Information
First Listed on Newegg	August 15, 2019

Return for refund within: 30 days
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Warranty Notice:
This product does not include manufacturer warranty when purchased or used outside of its designated sales region. By purchasing internationally, you acknowledge that warranty support from the manufacturer will not be available.