What are differences between half bridge vs full bridge LLC resonant SMPS ?

[tigrou]

Context : I want to buy a new power supply for computer. The two models I am looking at are SeaSonic Focus Gold and Corsair RM750x.

I took a look at reviews (here and here) and found that both are using LLC resonant topology for primary side.
The difference is one is half bridge (2 main switchers), the other is full bridge (4 main switchers).

My knowledge about SMPS is limited but from I understand LLC resonant topology (vs simpler design) allow to reduce losses during switching (which should be done when voltage is as close as possible to zero)

I am not directly asking which one I should buy, is corsair better than seasonic, .... or other PC stuff (this forum is about electronic in general not PC hardware).
What I would like to know is if it make a major difference in terms of SMPS stability and performance.

I am a bit surprised the SeaSonic one came with a full bridge as it is (AFAIK) usually used for high power stuff (eg : >2KW).

[T3sl4co1l]

Right, power is usually the difference.  More switches does afford more control options (e.g., phase shift PWM), but it's not obvious if that's used here.  (I think it tends not to be used due to EMI reasons, but who knows.)

It may allow the savings of some capacitors (half bridge is usually working against a coupling cap to GND, or a cap divider between DC+/-), but at the cost of more drive circuitry, and probably a more expensive controller.

Either kind can be made stable and efficient, or unsafe and hot.  You'd have to do a deep teardown to figure that out.

Tim