A Detailed Look

The PRIME 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. But 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 Titanium Series power supply enclosures are painted satin black with white lettering and chrome fan grill trim. The units measure 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.

All three power supplies use the same high-quality 135mm Hong Hua fan (HA13525M12F-Z) that incorporates a fluid dynamic bearing for quiet operation and long, reliable life. The fan is rated for 0.36A and 1800 rpm at 12 VDC.

The PRIME 850W front panel includes sixteen connectors for the modular cables, all nicely labeled. Note the connectors are rather closely spaced, which made it slightly difficult to get my large fingers in to release the latches when I wanted to disconnect cables from a fully populated PSU.

PRIME 850W Titanium PSU with Cables

The PRIME Titanium Series power supplies each come with an excellent assortment of fully modular cables for easy installation and clean builds. All of 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 three PRIME  Titanium Series power supplies.  Of course Seasonic is the OEM! The layout and build quality appear to be excellent.

PRIME 650W Titanium PSU

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.

PRIME 750W Titanium PSU

As you can see in the photos, the internals very similar for all three power supplies. The main difference is the size/rating of various components increases as the power output goes up. All of the Japanese made capacitors are rated for 105°C operation.

PRIME 850W Titanium PSU

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