Seasonic Reveals New and Improved X-Series Power Supplies
The newest generation to the Seasonic X-Series power supplies improves on reliability and performance while maintaining its high quality 80 Plus Gold label.
The next generation Seasonic X-Series models are available in 650 W, 750 W, 850 W, 1050 W and 1250 W variations to ensure that users with light or heavy workloads are satisfied. The X-Series power supply units feature a fully modular DC connector with an integrated Voltage Regulator Module (VRM). This new design feature offers a DC to DC conversion with a lower current and higher efficiency, while maintaining full modularity. Seasonic claims this will not only improve reliability, but also performance.
Additionally, the new X-Series PSU's are equipped with a “Hybrid Silent Fan Control”, which allows the unit to adjust fan operation automatically based on ambient temperatures. This feature includes a Fanless Mode, a low speed Silent Mode and a high speed Cooling Mode.
For more information on the new generation Seasonic X-Series power supplies, visit the X-Series product page.

Shut up.
Wouldn't most mid-range PSUs have the ability to adjust their fan speed?
Eh, whatever. If the marketing gains a few more customers, then I suppose it's worth it...
Shut up.
The fan isn't on until it is needed.
I will only buy Seasonic from now on.
not seeing the benefit over previous X-Series here
Don't reply to them it just makes the link show up again. They will get smothered with down votes anyways