The Seasonic PRIME Titanium PSU (650W, 750W, 850W) Review: Mythical Performance
by E. Fylladitakis on April 7, 2017 9:00 AM ESTHot Test Results
The electrical performance of the new Seasonic PRIME Titanium units is unbelievable. We are unsure how Seasonic even managed such power quality and performance figures.
| Seasonic SSR-650TD - Main Output | ||||||||
| Load (Watts) | 130.29 W | 325.85 W | 488.11 W | 650.38 W | ||||
| Load (Percent) | 20.04% | 50.13% | 75.09% | 100.06% | ||||
| Amperes | Volts | Amperes | Volts | Amperes | Volts | Amperes | Volts | |
| 3.3 V | 1.78 | 3.34 | 4.45 | 3.34 | 6.67 | 3.33 | 8.89 | 3.33 |
| 5 V | 1.78 | 5.03 | 4.45 | 5.03 | 6.67 | 5.01 | 8.89 | 5.01 |
| 12 V | 9.6 | 12.02 | 24.01 | 12.02 | 36.01 | 12.01 | 48.02 | 12 |
| Line | Regulation (20% to 100% load) |
Voltage Ripple (mV) | |||||
| 20% Load | 50% Load | 75% Load | 100% Load | CL1 12V |
CL2 3.3V + 5V |
||
| 3.3V | 0.2% | 4 | 4 | 6 | 8 | 4 | 6 |
| 5V | 0.25% | 4 | 6 | 6 | 8 | 4 | 6 |
| 12V | 0.15% | 4 | 4 | 6 | 8 | 6 | 6 |
| Seasonic SSR-750TD - Main Output | ||||||||
| Load (Watts) | 150.34 W | 375.71 W | 562.75 W | 750.4 W | ||||
| Load (Percent) | 20.05% | 50.09% | 75.03% | 100.05% | ||||
| Amperes | Volts | Amperes | Volts | Amperes | Volts | Amperes | Volts | |
| 3.3 V | 1.81 | 3.33 | 4.53 | 3.33 | 6.8 | 3.33 | 9.07 | 3.33 |
| 5 V | 1.81 | 5.02 | 4.53 | 5.02 | 6.8 | 5.01 | 9.07 | 5.01 |
| 12 V | 11.25 | 12.02 | 28.11 | 12.02 | 42.17 | 12 | 56.23 | 12 |
| Line | Regulation (20% to 100% load) |
Voltage Ripple (mV) | |||||
| 20% Load | 50% Load | 75% Load | 100% Load | CL1 12V |
CL2 3.3V + 5V |
||
| 3.3V | 0.2% | 4 | 4 | 6 | 8 | 4 | 6 |
| 5V | 0.25% | 4 | 6 | 6 | 10 | 4 | 6 |
| 12V | 0.18% | 4 | 4 | 6 | 8 | 6 | 8 |
| Seasonic SSR-850TD - Main Output | ||||||||
| Load (Watts) | 170.49 W | 426.27 W | 638.38 W | 851.07 W | ||||
| Load (Percent) | 20.06% | 50.15% | 75.1% | 100.13% | ||||
| Amperes | Volts | Amperes | Volts | Amperes | Volts | Amperes | Volts | |
| 3.3 V | 1.84 | 3.34 | 4.6 | 3.34 | 6.91 | 3.33 | 9.21 | 3.33 |
| 5 V | 1.84 | 5.04 | 4.6 | 5.04 | 6.91 | 5.02 | 9.21 | 5.02 |
| 12 V | 12.89 | 12.03 | 32.23 | 12.03 | 48.35 | 12.01 | 64.46 | 12.01 |
| Line | Regulation (20% to 100% load) |
Voltage Ripple (mV) | |||||
| 20% Load | 50% Load | 75% Load | 100% Load | CL1 12V |
CL2 3.3V + 5V |
||
| 3.3V | 0.2% | 4 | 4 | 6 | 8 | 4 | 8 |
| 5V | 0.25% | 4 | 6 | 8 | 10 | 6 | 8 |
| 12V | 0.15% | 4 | 4 | 8 | 10 | 8 | 6 |
We had to check our readings down to the fourth decimal point, as the voltage regulation on the main 12V line is below 0.15%, meaning that a cheap 2-decimal point voltmeter might not even display a difference at all across the entire load range. The 3.3V/5V lines are a little less tightly regulated but still remain amongst the most stable that we have ever seen, with our worst result being 0.24% for the 5V line of the 850W model.
The power quality of all three PRIME Titanium units is insanely good, with our oscilloscope never reading a voltage ripple above 10mV under any operating conditions. We have never seen such effective filtering before on consumer level products.
Despite the exceptional efficiency of the PSUs, the fans are significantly more lively with the units operating into our hotbox, as the thermal control circuit is trying to maintain low internal operating temperatures. The PRIME Titanium units all begin with noise figures when lightly loaded but their fans will keep increasing their speed alongside with the load, reaching clearly audible figures with loads above 300 Watts and even becoming noisy with >46 dB(A) figures when they units are very heavily loaded. The maximum temperature that our instruments recorded was just below 80 °C, which is very low for an 850W PSU operating at maximum capacity, meaning that Seasonic could trade some of the thermal performance for better acoustics. These units do come with a 12-year warranty though, so the designer could perhaps not afford >90°C figures appearing into any of these units.
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DanNeely - Saturday, April 8, 2017 - link
If Seasonic wanted to make a status connector to the mobo, they could just terminate it in a plug for a USB2 header like the one company currently making them is.EasyListening - Monday, April 10, 2017 - link
Does it do RGB?SkipPerk - Wednesday, May 3, 2017 - link
It does not do RGB because it is VR-ready!blahsaysblah - Sunday, April 9, 2017 - link
No, PS internals have gotten a lot better. The cabling/connectors have not kept up.As i went through the effort of having my latest PC have all custom power cables(not for looks), i researched quite a bit and than having done it(not just read/talk), the connectors and cabling can stand to get modernized quite a bit.
These connectors were designed for a time when the vision and landscape for PCs was very different. Everyone was going to have their own. Like how each house had multiple TVs. TV numbers have died off as the landscape has changed. So have PCs. The internals and toolings should match the new PC user. Grandma/pa/person who doesnt need it: they use smartphone/tablet/laptop. It's very much a power user.
status??? how about temperature, so you could have system fans do the heavy lifting? or give the OS a chance to do something about a bad situation?
Alexvrb - Tuesday, April 11, 2017 - link
OK, I get adding "status" output (even though it's a pretty dry and useless data stream to stare at if you have a PSU that's so rock solid it can run for a decade straight without twitching). But how exactly do you propose they "modernize" the cabling and connectors? Not even considering that changing connectors to a new standard for no good reason (other than to piss all over existing standards that work fine) seems silly, there's other issues too. Someone else mentioned it already but it bears repeating: if you reduce the number of wires, but you still need to carry the same amount of current, you MUST move to heavier gauge wires. That means thick, less flexible cabling that people would hate. Does that sound modern? What's the benefit? Are you a better engineer just waiting to show off your superior designs?Asryan - Wednesday, August 19, 2020 - link
I have the 850w but I'm experiencing gpu coil whine..I had read that this kind of coil whine is not dangerous for the devices , whether it is the power supply or the graphics card, could you confirm it to me.
What is weird is that the noise occurs at + 30FPS +, i've limited FPS to find out it does not occurs only at high fps as i was used to with coil whining GPU... I try to play with the sliders of MSI afterburner and I can hear that the sound changes .
After that I only hear it if the fans are at their lowest and the panel is open so if it is certain that it cannot harm my configuration, it is not very serious but I would like to be sure.
However I would like to understand because the problem arises with:
2 different graphics cards (EVGA FTW3 2080ti and Asus Strix 2080ti Oc that someone gave me for test purposes). The two cards do not make this noise in another config
2 power supplies of the same model (Seasonic Ultra Prime titanium 850w)
2 motherboards of the same model. Asus Maximus Hero XI
Cstate on and off
Mod cable cables or original cable
it's driving me crazy mostly because I don't understand WHY but I'm pretty sure it's psu related..
bill.rookard - Friday, April 7, 2017 - link
I have to say, I'm absolutely blown away by the quality of the power coming out of those units. The ripple figures are insane (in a good way!). Considering that I'm looking for a new PSU - this may be 'the one' even at a $160-180 price tag.helvete - Friday, June 16, 2017 - link
Exactly. shame they don't offer some 400 - 450W variant.Shadowmaster625 - Friday, April 7, 2017 - link
It is nice to know that if you pay an extra $70 for a power supply, namely a whopping $4-10 a year in electricity savings! Boy, high efficiency sure does pay for itself dont it?Phiro69 - Friday, April 7, 2017 - link
Written like a true Republican.