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Cross-Load Tests & Infrared Images
Our cross-load tests are described in detail here.
To generate the following charts, we set our loaders to auto mode through our custom-made software before trying more than 25,000 possible load combinations with the +12V, 5V and 3.3V rails. The load regulation deviations in each of the charts below were calculated by taking the nominal values of the rails (12V, 5V and 3.3V) as point zero. The ambient temperature was between at 30°C (86°F) to 32°C (89.6°F).
Load Regulation Charts
The efficiency sweet spot is between 160W and 410W of load on the +12V rail (while load on the minor rails is lower than 50-60W). In most of its operating range, the SSR-750FX delivers 85-90% efficiency.
We applied half-load for 10 minutes with the PSU's top cover, along with its cooling fan, removed before taking photos with our modified FLIR E4 camera that delivers 320x240 IR resolution (76,800 pixels).
Temperatures inside the PSU are quite low, despite the half-load we applied for a 10-minute period. This indicates that Seasonic could make its fan profile less aggressive if it wanted to. But the company's engineers are probably playing it safe in order to offer a 10-year warranty.
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Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.
Thank you for the detailed review.Reply
In the transient response test
Advanced Transient Response at 50 Percent – 200ms
the +3.3 pass.
As always, here are the most detailed reviews on the PSU.Reply
Thank you and keep it up!
The only thing that is not quite clear to me. What is the criterion for voltage drop in % to get PASS/FAIL in "Advanced Transient Response Tests"?
You declare that:
"In all tests, we measure the voltage drops." The voltages should remain within the ATX specification's regulation limits. "
For ATX 2.2 we have:
12v - 10%
5v - 5%
3.3v - 5%
5VSB - 5%
However, looking at your reviews, there are often situations where, at <5%, the power supply gets the FAIL mark and vice versa, some at >5% receive PASS
Why is this happening?
Sorry, a typoReply
Of course for 12v - 5%
the limit is 5% however the voltage rails of the PSUs' under test in the majority of cases aren't at the nominal voltages, but higher, so even with 5% deviation voltages go don't bellow the limits that the ATX spec sets (11.4V, 4.75V, 3.14V). Only if a rail goes below those voltage levels it fails. The 5% is just an indication that the ATX provides to specify the voltages above.Reply
Now everything became clear to me.Reply
Dell Inspiron 5675 Desktop, PSU (power supply unit), upgrade. Would this PSU compatible with Dell Inspiron 5675 Desktop. It came with 460W I would like to replace it with PSU between 650 to 750W. I tried at Dell forums but cannot get a clean link which one would be compatible.Reply
I would greatly appreciate if someone could help me out. Thank you kindly in advance:
Compatible Power Supply needed for Inspiron 5675 Gaming Power Supply
AMD Ryzen 7 1700X 3.4GHz Octa-Core Processor
8GB 2400MHz DDR4 RAM
1TB 7200 RPM Hard Drive
AMD Radeon RX 580 8GB GDDR5 Graphics Card
Dual Band WiFi 802.11ac + Bluetooth 4.1
Windows 10 Home (64-bit)
460 Watt Power Supply w/ Polar Blue LED
Includes: Dell KB216 Wired Keyboard + Dell MS116 Wired Mouse
6x USB 3.0
1x USB 3.1 Type-C Gen 1
2x USB 2.0
1x Audio Combo Jack
1x 3-in-1 Media Card Reader
1x P/S 2
1x 7.1 Channel Audio Out
3x 3.5" bay
2x 2.5" bay
2x PCIe x1
2x PCIe x16
My Seasonic Platinum began failing under load after only 10 months. Paid cash here in Japan at Joshin - couldnt find reciept - honestly never thought I would need it ever. Seasonic would not help me.?Reply