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I used 3900X with L9a for about 2 months. Temps are unacceptable with stock clock, let alone PBO enabled. The only way to make it work at acceptable temp is to turn ECO mode on to limit the CPU to just 65W PPT. As such, just get a 5600X if you plan to stick with the Dan A4; if you want to use 5900X, get a larger case for more cooling capacity.