A Detailed Look
The PRIME Ultra Titanium Series power supplies incorporate extremely tight voltage regulation, which Seasonic calls Micro Tolerance Load Regulation (MTLR). This results in the three primary rails (+3.3V, +5V, and +12V) exhibiting less than or equal to 0.5% voltage drop within the tight 2% voltage regulation range!
Micro Tolerance Load Regulation – MTLR
(Courtesy of Seasonic)
One of the techniques that Seasonic uses to achieve such tight load regulation is remote voltage sensing, which is implemented by adding voltage sense wires to the 24-pin ATX cable bundle. For the +3.3V, +5V and +12V DC outputs load carrying wires deliver power from the PSU to the 24-pin ATX connector. And additional wires are added to “sense” each of the voltages at the ATX connector and send a signal back to the load regulation circuits. As the load increases, voltage typically drops at the connector, and the load regulation circuits compensate by slightly increasing the output voltages as the loads go up.
The Seasonic PRIME Ultra Titanium Series power supply enclosure is painted satin black with white lettering and features chrome fan grill trim. The unit measures 170mm (6.7”) long. The back panel includes an On-Off switch, AC receptacle and a Hybrid Mode switch to enable or disable fanless operation.
The power supply uses a high-quality 135mm Hong Hua fan (HA13525L12F-Z) that incorporates a fluid dynamic bearing for quiet operation and long, reliable life. The fan is rated for 0.22A and 1600 rpm at 12 VDC.
The PRIME Ultra 750W front panel includes thirteen connectors for the modular cables, all nicely labeled. The four PCI-E cables each have a single dedicated 6+2 pin connector.
The PRIME Ultra Titanium Series power supplies all come with an excellent assortment of fully modular cables for easy installation and clean builds. The cables are the flat ribbon-style except for the 24-pin ATX cable which is covered with black plastic braiding.
(Courtesy of Seasonic)
Under the Hood
Here are a few pictures showing the layout and components inside the 750W PRIME Ultra Titanium power supply. Of course Seasonic is the OEM! The layout and build quality appear to be excellent.
Seasonic is using a state of the art, high-performance full-bridge LLC, Synchronous Rectification power conversion design along with DC-to-DC voltage regulators located on a daughter card to provide outstanding voltage regulation and high efficiency.
All of the Japanese made electrolytic capacitors are rated for 105°C operation. For example, the two primary bulk capacitors are rated for 470/560uF, 400V, 105°C.