Since both the Ryzen 9 3900X and the Ryzen 9 3950X use two 7nm die, but the 3950X requires that both dies be fully functional and ryzen 3900X is still somewhat hard to find you can bet that availability will be scarce the first one - two months... Also I see that even AMD recommends to use a 280mm AIO liquid cooler for this CPU, if not something even larger. You can use "eco mode" - ECO mode results in performance decreases in the neighborhood of 10% – 15%. with total power drop in the neighborhood of the 3700X which is still great. Maybe I missed it but the ECO mode was not tested here in this review???