Hot Test Results

For our power supply testing, we are using high precision electronic loads with a maximum power draw of 2700 Watts, a Rigol DS5042M 40 MHz oscilloscope, an Extech 380803 power analyzer, two high precision UNI-T UT-325 digital thermometers, an Extech HD600 SPL meter, a self-designed hotbox and various other bits and parts. For a thorough explanation of our testing methodology and more details on our equipment, please refer to our How We Test PSUs post.

The energy conversion efficiency of the Lian Li SP750 is remarkably stable, dropping an average of just 0.4% with the unit operating inside our hotbox. The degradation is greater at higher loads, naturally, but there are no signs of significant thermal stress.

The cooling fan of the Lian Li SP750 starts almost immediately after powering on the PSU into our hotbox, as expected from its thermal control circuitry. Noise levels are tolerable at first but the speed of the fan increases quickly, reaching maximum speed with a load of about 400 Watts. As the fan cannot spin any faster, the internal temperature of the units starts climbing even faster, reaching very uncomfortable temperature figures when the PSU is fully loaded in such an environment. The protective circuits did not shut down the unit and there was no indication of excessive stress to any of its performance indicators, yet we would not recommend allowing the PSU to ever run anywhere near that hot.

Cold Test Results (~25°C Ambient) Quality & Conclusion


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  • kdogg4536 - Tuesday, July 13, 2021 - link

    $140 I think I will pass until they build up a proven track record for that much money. One good review is a nice start but not enough to get my $140 Reply
  • kaidenshi - Tuesday, July 13, 2021 - link

    I'd take it at that price. I paid $99 for the 550W Focus SFX PSU in my mini-ITX build, and I would have gladly paid $50 more for a 750W from a company with a better reliability record if it had been available at the time. Reply
  • Foeketijn - Tuesday, July 13, 2021 - link

    It always interests me, how these business plans enfold. If I was Lian Li and wanted to make such a A grade >100 dollar PSU, I would go to the best name brands, who are coincidental also in Taiwan.
    Make sure it has for example the best cooling fan and only Japanese parts. Just to make sure that first new product sets the stage for whatever comes next.
    Especially For a Taiwanese company, how come it's a Chinese PSU with Chinese parts (other than the fan). Why take the risk? Why not support your local industries?
    I try to avoid buying stuff from China as much as possible because I don't like the politics, and slavery. We vote with our spending. And I'm not Taiwanese. Fascinating
  • Jasonovich - Tuesday, July 13, 2021 - link

    I don't think geopolitical sentiments have any value on an IT website. Most brand names have their operations outsourced to China and some very fine quality electronic components come from China.
    If you're into main stream media and you believe everything your government says that's fine, enjoy your poison but slavery?
    What about Nike, Addidas, Apple, the list is long.I assume you're OK with Israel and apartheid ?
  • Questor - Tuesday, July 13, 2021 - link

    If it stays on topic, geopolitical statements can be valuable information to inform the consumer. When it veers off topic, then it has no value. Reply
  • Foeketijn - Tuesday, July 13, 2021 - link

    Interesting reply. I am not saying China can't make propper stuff. I am just saying, the best PSU's are made in Taiwan. Why gamble with an relatively unknown producer.
    And ofcourse geopolitics play a role. I don't think Australians will outsource much to China ATM. Just like Indians won't likely outsource anything to Pakistan.
    It's not black an white. And has it's place on any website including IT. As long as it's ontopic.
    Off topic, you guessed right, I never buy anything from those brands. And that list is indeed very long. I am not against China, I don't like most things about globalisation (I do like that I can write this to you), and I hate slavery. Can't proof you didn't use slavery? I won't buy.
  • WonkoTheSaneUK - Thursday, July 15, 2021 - link

    "What is strange here is the presence of three PCI Express connectors, because the SP750 clearly has the power output for two middle-range graphics cards but the lack of a fourth connector deprives users from that choice."

    3 PCIe connectors isn't strange at all.
    750W is enough power to run a Nvidia RTX3080 or RTX3090 graphics card, and some of the AIB cards require 3 such connectors, instead of Nvidia's new, smaller single 12-pin connector, used on the "Founder's Edition" cards.
  • eldakka - Sunday, July 18, 2021 - link

    I think the comment was about ONLY having 3 connectors on a 750W PSU, as it is capable of running 2 GPUs each requiring 2 connectors for a total of 4, which this PSU doesn't have.

    I don't see it as a problem for gamers, as they'd most likely go for a single high-power card (max 3 connectors needed), but gaming isn't the only use case out there ;)
  • faaaaq - Wednesday, July 28, 2021 - link

    I just grabbed the 011 Mini deal from Newegg that came with this, for like $200. My first SFX PSU and man is it teeny tiny. Powering my heavily-overclocked 5950x, moderately overclocked 3080 FE, nine RGB fans, two water pumps (GPU and CPU are each on their own AIO cooling loops), and 4000mhz DDR4. No issues so far but Ive only had it since yesterday, replacing my Seasonic 750w ATX PSU and CoolerMaster H500. I had not looked up reviews before purchasing the case + PSU combo, so its nice to see the PSU ended up being very high quality. Nice. Reply

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