How much of The Romance of the Three Kingdoms is factual

There are two books about three kingdoms, one is called Three Kingdoms, it is fully factual, The Romance of the Three Kingdoms is anohter book, be more precise it is a novel based on Three Kingdoms, it is 70% factual and 30% non-factual, the most non-factual part in The Romance of the Three Kingdoms is the red cliff battle, only for this battle is 30% factual and 70% non-factual.
So maybe you could say the red cliff battle is the only non-factual part in The Romance of the Three Kingdoms.