Review Index:

Seasonic PRIME 600W Titanium Fanless Power Supply

Manufacturer: Seasonic

Introduction and Features

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Seasonic’s updated power supply lineup now includes the new PRIME Titanium Fanless model that can deliver up to 600W. The SSR-600TL is one of the latest members in Seasonic’s popular PRIME series. This new flagship PRIME fanless model boasts 80 Plus Titanium certification for the highest level efficiency.  

Sea Sonic Electronics Co., Ltd has been designing and building PC power supplies since 1981 and they are one of the most highly respected manufacturers in the world. Not only do they market power supplies under their own Seasonic name but they are the OEM for numerous big name brands.

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The Seasonic PRIME 600W Titanium Fanless power supply features Seasonic’s Micro Tolerance Load Regulation (MTLR) for ultra-stable voltage regulation and comes with fully modular cables, all Japanese made capacitors, and is backed by a 12-year warranty.

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Seasonic PRIME 600W Titanium Fanless PSU Key Features:

•    Fanless operation (0dbA)
•    600W continuous DC output
•    Ultra-high efficiency, 80 PLUS Titanium certified
•    Micro-Tolerance Load Regulation (MTLR)
•    Excellent AC ripple and noise suppression
•    Fully modular cabling design
•    Multi-GPU technology support
•    Conductive polymer aluminum solid capacitors
•    High reliability 105°C Japanese made electrolytic capacitors
•    Ultra-Ventilation honeycomb structure
•    Dual sided PCB layout
•    High capacity +12V output
•    Active PFC (0.99 PF typical) with Universal AC input
•    Protections: OPP,OVP,UVP,SCP,OCP and OTP
•    12-Year Manufacturer’s warranty

Here is what Seasonic has to say about their new PRIME Fanless PSU:

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The PRIME 600 Titanium Fanless utilizes the fanless technology, which eliminates the fan noise completely, ensuring truly quiet operation. The unit not only is rated to be 80PLUS Titanium efficient, but it also has the highest power output on the fanless power supply market at the moment. The power supply is ideal any situations that demand silence from the equipment. The high quality components inside and the innovative circuit design result in clean and stable power output. The fully modular cables allow for better cable management in the computer case.

Seasonic employs the most efficient manufacturing methods, uses the best materials and works with most reliable suppliers to produce reliable products. The PRIME Series layout, revolutionary manufacturing solutions and solid design attest to the highest level of ingenuity of Seasonics’s engineers and product developers. Demonstrating confidence in its power supplies, Seasonic stands out in the industry by offering PRIME Series a generous 12-year manufacturer’s warranty period.”

Please continue reading our review of the Seasonic PRIME Fanless PSU!!!

Review Terms and Disclosure
All Information as of the Date of Publication
How product was obtained: The product is on loan from Seasonic for the purpose of this review.
What happens to product after review: The product remains the property of Seasonic but is on extended loan for future testing and product comparisons.
Company involvement: Seasonic had no control over the content of the review and was not consulted prior to publication.
PC Perspective Compensation: Neither PC Perspective nor any of its staff were paid or compensated in any way by Seasonic for this review.
Advertising Disclosure: Seasonic has purchased advertising at PC Perspective during the past twelve months.
Affiliate links: This article contains affiliate links to online retailers. PC Perspective may receive compensation for purchases through those links.
Consulting Disclosure: Seasonic is not a current client of Shrout Research for products or services related to this review. 

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March 2, 2018 | 05:23 PM - Posted by Photonboy

In what world is this F*****G power supply going to stay below 40degC to keep from dropping down to 480W?

It will also dissipate much MORE HEAT into the main case anyway thus the other parts will have fans spin up more so it may be louder anyway.

I doubt you'd make a completely FANLESS system either (I know they recommend against that) since if you needed that much power and had no fans I doubt you'd keep the temperature below 40degC (especially in warmer areas).

Maybe I'm just stupid, but can anyone explain who might use this besides someone with relatively LOW POWER draw who wants a really quiet system (for which their already are PSU's that turn OFF their fans anyway)?

March 2, 2018 | 09:41 PM - Posted by Cyclops

At over 91% efficiency, only 9% of electricity is converted into heat, which in the case of this power supply, is 54 watts at 100% load. It's negligible.

I use a Fanless SeaSonic SS-520FL2 in my system paired with an overclocked 1080 Ti. It's a flawless operation. The system is liquid cooled with fans set to barely audible levels, so even under load, you can't hear anything.

March 4, 2018 | 04:07 AM - Posted by AnonymousLocust (not verified)

Your math is backwards, although your error in this case is rather insignificant.

The 91% are what the power supply delivers. 100% is what it draws from mains. In a simplified scenario, if the PSU delivers 600 W with a 91% efficiency, then it draws around 659 W from the mains (659 * 91% = 600). Thus, the loss is not 54 W but 59 W.

March 5, 2018 | 09:29 AM - Posted by Particle (not verified)

To add to your point for his/her benefit:

A simple shorthand for figuring out this sort of problem is to take the power out and not do any sort of multiply but rather perform a divide. Power out divided by efficiency equals power in. Power in minus power out equals power lost in conversion.

600 watts out / 0.91 efficient = 659 watts in

659 watts in - 600 watts out = 59 watts lost in conversion

March 3, 2018 | 01:14 PM - Posted by M (not verified)

You can always mount the PSU _outside_ the case (if the case allows of course)

Done it once at a system with dual Nocona Xeon's.. That was the only option to lower overall fan noise..

Unfortunately back then the max fanless PSU you could find was topping at 300W..

March 4, 2018 | 04:00 AM - Posted by John H (not verified)

Blower style GPU is probably what this is intended for.

March 2, 2018 | 09:42 PM - Posted by Cyclops

80+ Silver is a rating which no one seem to aim for anymore. You can find numerous power supplies rated for everything under the sun but not 80+ Silver. I wonder why that is.

March 5, 2018 | 08:59 AM - Posted by Jabbadap

Well many Dells, HPs and other PCs are usually been with 80plus silver PSU(With OEMs like Lite ONs, FSPs, Deltas). But now-a-days those too have been moving to gold rated ones...

I actually don't remember seeing silver rated psus on normal retail sale.

March 3, 2018 | 07:29 AM - Posted by VintageDude (not verified)

Sort of agree, any power supply of this size should come with a fan. You decide to run it at the speed, sound of your desire. Heat rises.

March 5, 2018 | 02:45 PM - Posted by Power (not verified)

Couple of fan headers would be nice.

March 8, 2018 | 07:57 PM - Posted by Photonboy

40degC vs 9% heat dissipation.

First off, HEAT and TEMPERATURE are certainly related but it's the DENSITY of heat that matters most, especially if a temperature sensor is near components in the PSU that get hotter than the average temperature of that PSU.

Remember that the INTERNAL case temperature can get pretty high, though of course it's much lower at the bottom. However, I have a sensor at the BOTTOM of my motherboard hitting roughly 50degC when gaming (i7 + GTX1080, 3xNoctua case fans at 700RPM).

So how hot is this PSU getting in a typical case at say 500W PSU load? (the spikes you should care about)

So adding 50W or so of heat raises the temperature above whatever it would normally be just sitting at that point in the case. If you're at 35degC then maybe that's enough to hit 40degC.

*As a solid product it may make sense as a long-term investment, but I'd like more numbers on how close to the 40degC cut-off it's getting to based on (at 500W+ power draw):
a) ambient room temperature, and
b) case cooling

In the SUMMER if I hit 30degC for example would I drop down to 480W power load in a particular system?

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