Is this ramstick compatible with mine?

Memory is guaranteed in the form sold. Combining multiple modules sold as singles are not guaranteed to be compatible together.

What may happens is the memory may no longer be able to operate at rated specifications anymore. Since the modules have never been tested together there are no guarantees how it will operate if the PC boots up.
 
Jul 10, 2018
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I found the specifics of my RAM if that helps.. https://www.samsung.com/semiconductor/dram/module/M471A1K43BB1-CRC/