I've found that using X.M.P Profile settings on my 2400 DDR makes idle at 13W according to CoreTemp. Without XMP, 4W and idle cores at 30º-35ºC which is good.
Instead of XMP profile, I choose to set the memory speed manually and leave the remaining settings untouched.
In anycase, high temperatures under load still occur (between 75 and 85ºC).
I don't know what to do! This is a CPU fault Intel?