I don't know anyone who buy B450 will plan to upgrade to X3950? Even if it does run, the VRM will be working at its max.
The MSI B450 lines were the highly recommended mobos for low budget user, so much so that the price got artificially jack up. eventhough it lack many features, maybe because the budget MSI X570 mobo suck too much?
Anyway, if you gonna get mobo from Newegg sg, there are way better boards for slightly more. For example, the
real budget board that could run X3950 without breaking a sweat--the ASUS Prime X570-P, can be had for
S$214.
Or if you only running X3950 at stock but need WiFi 6, the Asrock X570 Steel Legend is
S$243.