Having WHEA L0 cache means your CPU is not really that stable, but not really that unstable to cause error or crashing/lockups. Usually either raise the voltage slightly or reduce the clockspeed a little bit to make the error go away.
No, Intel listed the maximum speed officially supported so you can use slower RAM on it without trouble. Intel CPU aren't really sensitive with RAM speeds unlike Ryzen so you are good to go
I'm undecided since my GTX 1070 is still good enough for 1080p gaming. I'll wait for another wave of new cards. Even nvidia lineup is not that attractive.
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