I stumble on a review that seems very interesting from TechPowerUp, Super Flower Leadex III 650 W Review, and seems to be a very good option noise wise, probably we wont see it in the US until EVGA adopts this sku or something similar, regardless here are some comments in case you are interested.
Its probably going to be a good option, for those who fear Seasonic PSU in terms of coil or electrical noise (i yet to encounter, but some here do), and depending pricing it should rival the Corsair RMx that its recommended a lot here.Another excellent power supply from Super Flower. The 650 W Leadex III unit is dead silent, beating even the Corsair RM650x in terms of noise output.
Under normal operating conditions, the fan will rarely spin, especially if you switch to Mode 0. Even with increased load on the minor rails, the PSU can handle the thermal load and doesn't activate the fan.
To wrap up, the Super Flower Leadex III with 650 W maximum power output performs very well and is among the quietest PSUs money can get you today. This is practically a passive unit with a fan to handle incredibly harsh conditions.