OWC 4GB DDR4 PC4-21300 2666MHz NON-ECC. Compatibility QNAP RAM-4GDR4A0-SO-2666. QNAP RAM-4GDR4T0-SO-2666. QNAP RAM-4GDR4T1-SO-2666. Watch our OWC Basic Installation Video for Help. Capacity 4GB Form Factor 260-PIN SODIMM.
eBay