I am currently using HP laptop of model 15-da2012TU (Notebook). According to specifications, it has 4GB RAM with 2666MHz of speed. But now I want to upgrade it. Can I use 8GB, 2666 MHz RAM with existing 4GB RAM or do I need to have another 4GB RAM with 2666MHz of speed ? What would be the best option ? Could you please help me ?
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