This means that these processors ship with a 65W TDP - higher than Intel's top-performing mobile H solutions. This move may come in handy for some users that wonder regarding upgradeability of a given AIO they're eyeing - if it comes with a Core-B processor, you know it won't be user-serviceable, much less upgradeable. The line-up will start with the Core i7-8700B, i5-8500B, and i5-8400 (yes, there's an absence of a B there) processors, all shipping with a 65 W TDP, and equivalent to their desktop counterparts - core counts, base frequencies, turbo frequencies, memory support, Optane support, and integrated graphics are all the same. The only difference is that these CPUs are likely - and should be expected - to be placed into TDP-limited scenarios enabled through firmware.
Source : TechPowerUp