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.
I just wonder how are you
I just wonder how are you going to clean, while still keeping it under warranty, something that has a 12 year warranty.
I have an original Prime 650
I have an original Prime 650 (not Ultra) and would like to know specifically how they differ.
It would seem the Ultra is just a Prime, with a couple of meaningless upgrades. Is this true?
Yes, as we said above, the
Yes, as we said above, the Ultra is an upgraded PRIME. Along with some minor tweaks to the design (Seasonic does not specify exactly what) the main difference is the longer 12-year warranty – I wouldn't call that meaningless. If you have an original PRIME you should be well served for many years to come.
They did specify it, when
They did specify it, when they released upgraded Ultra line. See:
https://seasonic.com/news/post/prime-ultra-power-supplies/
Are the PSUs really that
Are the PSUs really that quiet? Basically not audible, quieter than the room? My computer’s fan go at 450RPM and I have no HDDs to make spinning noises anymore.
Yes, they are very quiet. But
Yes, they are very quiet. But sound/noise is subjective. Even though the SPL numbers are hard data different people respond differently to sound. To my ears, this PSU was very quiet – silent until the fan kicked in (no coil whine or electro-mechanical noise). The test lab is relatively cool and quiet (fairly constant 73 deg and 27 dBA) – to the point I opt to turn off the building A/C air handler during testing. Both the background temp and sound level will contribute to your experience of how loud a system is. Hope that helps answer your question.