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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Laststop311 - Monday, April 10, 2017 - link
I have a crucial mx 300 2TB for my storage and im waiting for 256GB optane SSD's to switch that over the boot drive and most used apps. I am not bothering with the caching version.Laststop311 - Monday, April 10, 2017 - link
o and i got it the 2tb ssd or 476 out the door here on sale https://www.superbiiz.com/detail.php?p=2050MX3SD1&...Laststop311 - Monday, April 10, 2017 - link
no optical drive all drive cages removed for max airflow as well. I am the most proud of the build if u cant tell it's in my bedroom and i cant even hear it when i sleep. I'm so ecstatic.Laststop311 - Monday, April 10, 2017 - link
email me is u need help building this exact PC i promise there isnt a single person that wont be thrilled to have it jtarmeni1 (AT) (g)(mail(dot)comLaststop311 - Monday, April 10, 2017 - link
and dont bother with any ram above 3400mhz cas 14 3400mhz provides the best performance of all ram trust me i tried.Laststop311 - Monday, April 10, 2017 - link
the higher timings negates the performance and u spend more money, until they release 3600 cas 14 3400 cas 14 is the fastestjo-82 - Monday, April 10, 2017 - link
Am i the only one who finds 40 dB(A) @ 50% load (300W) out of the question?Exodite - Tuesday, April 11, 2017 - link
No, though I've come to the realization that you have to treat dB measurements as an internal metric for each article/site and not an universal truth.Variations due to measuring methodology, equipment and ambient sound level means dB measurements don't compare well across different reviewers/sites.
Personally I prefer always-on equipment such as case and CPU fans to idle <20 dB and load noise, including GPUs, <30-35 dB so I reckon I'm in a similar position. Some reviewers, a surprising number even, have ambient sound levels higher than I'd tolerate even a fully loaded computer to make.
More than that dB measurements fail to pick up sound characteristics. A great fan/cooler can be tolerable at higher dB levels because the only real sound tends to be from moving air, a soft "whoosh" if you will. The bad ones add ticking or grinding, for example I find the default Radeon fans to be completely intolerable at any load level. And even fanless equipment may be saddled with electrical noise that cut right through the case and ambient sound.
In the end you really have to listen yourself to make a judgment and if that's not an option rely on a comparison to a unit you've heard yourself that's been tested by the same reviewer/under the same conditions.
Laststop311 - Tuesday, April 11, 2017 - link
u wont be disappointed with a 750 watt seasonic prime. The fans dont even turn on until u hit 375 watts of power draw. Which basically means even maxing out ur cpu isnt enough to turn them on. You have to play a game and most games utilize like on averahe 80% of ur cpu and yea the fan on the psu is dead silent when it does spin. Concentrate and getting a quiet GPU. Get a triple slot with GPU with a HUGE heatsink and adjust the fan profile till right before you hear it. The highe heatsink makes yup for the large speed. I really like the triple slot gpu's with 3x 100mm FDB fans plus nh d15s noctual cooler using liquid metal paste and the awesome titanium rated seasonic psu. With 11 blade fractacl venturi high flow fans with thge drave cages inside removed. this way you need no static pressure so even on low speeds the air pushes deep into the case and since its 2x 140mm inttake 1 140mm GP14 fractacl exhaust yu get positive pressure meaning you only have to clean the case once every 2-3 years as only microscopic particloes get in. You can run the fasn all at the lowest speed before you hear it even with good overclocks. I sleep right next to the bed thats how quiet it. Seriously I will facetime you thru the build for 45 buvks an hour. And teach you all the tricks to deaden every vibration while keeping all ur components in the 70C's or lessLaststop311 - Tuesday, April 11, 2017 - link
its the best build in the world if u want silence and still a lot of power, yes no9t the max power but if you all u care about is gaming at 1080 with 144hz which imo is better then 2560x1440 and 60hz by a far as well a 4k at 30-60hz by far