I was always told never to mix and match ram sticks but I'm currently using 3 different kinds of ram that are all the same speed and size and it's running just
A-Tech 8GB RAM for Lenovo IdeaPad 3 15ITL05 (1 x 8GB) DDR4 2666 MHz PC4-21300 Non-ECC Unbuffered SODIMM 260-Pin Laptop Notebook PC Memory Upgrade Stick Module at Amazon.com
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Which slots should the ram be in? There are 3 8 gig sticks. 2 of the same kind and 1 other brand. The CPU is on the left of the slots. There
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ASUS Prime X570-Pro won't post with more than one RAM stick : r/buildapc