Hardware Insights Forum

The TK20J60U FETS are rated for 0.165 ohms and not 1.165 ohms. 1.165 ohms might be acceptable for a sub-80 unit rated for half the wattage but not a 650W 80+ unit. Maybe I can't see it because it's so crowded in there, but I can't spot a small flyback transformer for +5VSB in the unit, so I wonder if it's generated using DC-DC conversion (maybe that's how they achieve the '"fan delay-off" feature).

You are right about the RDS-on of the switchers. That ways a typo, and I have fixed it. As for the 5vsb, the transformer is there, if you look very carefully at the overhead shot of the internals. It's buried under the overhangs of the switcher and secondary heatsinks.

A question about PFC Capacitor.
As you write in the review "The PFC capacitor is a beefy 560uF Primary capacitor from Nippon Chemi-con". As far as i understood when i read the review of Seasonic Platinum SS-660XP , it uses instead of 1 PFC Capacitor, 2 Nippon Chemi-con which are rated at 420v 220uF 105c.
http://www.hardocp.com/article/2013/02/ ... zrPKKJ7QYQ
Which one do you think is a better method that can guarantee better longevity for a PSU?

Neither option offers better performance or reliability than the other. It's like asking whether it's better to store water in two smaller tanks or one larger tank.