Memory RAM | 16GB Kit (2x8GB) - HP - HPE Business Desktop Pro 3520 (All-in-One PC) - (OEM-# Dual-Channel Memory Kit (2x B4U40AA)) - 1600MHz, Unbuffered, 1,5V
Memory RAM | 4GB - HP - HPE Business Desktop Pro 3520 (All-in-One PC) - (OEM-# B4U39AA) - 1600MHz, Unbuffered, 1,5V
Specs HP Pro 3520 Intel® Core™ i3 50.8 cm (20") 1600 x 900 pixels 4 GB DDR3-SDRAM 500 GB HDD All-in-One PC Windows 8 Pro Black, Silver All-in-One PCs/Workstations (B5F97EA)
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How to upgrade RAM memory in HP Pro 3420 AIO PC laptop - YouTube