They can, as long as the modules are in the same colored slots.

They cannot work together, 1 of them will lower its frequency what causes instability as it runs below the designed specs.

Daemon tools, Alcohol 120% and Power Archiver Pro uses SCSI Pass Through Direct (SPTD), which is a well known cause for BSOD's.
Please remove Daemon Tools and run the SPTD pass through remover.

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