RAM usually have lifetime warranty. But mainboard, unless the flagship ones may have 5 years, many only have 3 years. CPUs for example Intel, are only 3 years as well. Also, old motherboard doesn't support newer technology, for example m.2 and PCIE SSD as boot disk. For this reason I will not spend too much on "backup" hardware otherwise they will become a burden when some discontinued parts are broken.
I am using ASRock B85M Pro4 which only cost about $63 in my local stores and it supports up to i7-4790k or Xeon E3 1286 v3, and 32GB DDR3.
Now a single stick 16GB DDR4 costs about $115 and the lastest mainstream Intel and AMD mainboards support up to 64GB (4 sticks).
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