One of the stick shows 0mhz in bios but it passed memory test in memtest86 2@8gb 3600 c18-22-22 they work perfect 2@8gb 3600 c18-19-19 one of these shows as 0mhz in bios and in some motherboard z490 and z270 the pc won’t start with them However in my z690 board they work together as 32gb 3600mhz and the pc starts with them, I can play video games and they show as 32gb and I can safely run a huge stress test MemTest86
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