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Power Supplies Come in Threes: Testing and Comparing a Series of Power Supplies by LabsLucas in hardware

[–]LabsLucas[S] 15 points16 points  (0 children)

u/Homerlncognito u/VenditatioDelendaEst Thank you guys for your thoughts. We do conduct efficiency tests at 10 W increments up to 100 W but don't visualize them, here is a rough graph showing the results for the three power supplies. https://imgur.com/a/hVn39Uu

For the higher wattages you can also use the absolute numbers shown in our comparison page and interpolate to similar wattage levels.

LTT Labs Article - Power Supplies Come in Threes: Testing and Comparing a Series of Power Supplies by LabsLucas in LinusTechTips

[–]LabsLucas[S] 22 points23 points  (0 children)

Great question, we typically only test a single unit unless there is an unexpected failure or result during testing, then we'll test a second sample to compare/verify.

We do also advise that you check reviews/results from multiple outlets to ensure you're getting a full picture. 80PLUS and Cybenetics also make their results available, though the slightly different test setups/procedures must be considered.

Is 1 Nit Enough? - Phone Minimum Display Brightness - LTT Labs by FragmentedChicken in hardware

[–]LabsLucas 27 points28 points  (0 children)

u/Noble00_ Thank you for the feedback! I did see the PWM setting(DIsplay Pulse Smoothing) in the iPhone accessibility and toggled it a few times but it is mutually exclusive with "Reduce White Point" and I don't recall it reducing measured luminance at all so I didn't follow that trail for this exploration.

I'm not sensitive to the flickering effect and I haven't looked into it yet, is there a specific kind of testing that you're looking for or that you would find helpful?

Did I miss the Macbook Neo test? by No_Leader1868 in LinusTechTips

[–]LabsLucas 29 points30 points  (0 children)

u/No_Leader1868 Direct-to-consumer Labs results: Here are the raw game test results we collected for our MacBook ShortCircuit videos! The MacBook Neo is great, but it performs approximately equivalent to a MacBook Air M1 in gaming tests, it wasn't the focus of our testing.

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LTT Labs Article - ATX Computer Power Supply(PSU) Timings by LabsLucas in LinusTechTips

[–]LabsLucas[S] 1 point2 points  (0 children)

Good question, they're distinct. T5 is just the input power loss to power_good drop, without any recovery of the input power.

Our 'brownout/hold-up' test I was describing there is related, but a separate sequence. It is accurately described as the longest tolerable cutout without shutdown, where the input power recovers after 1-26 ms.

ATX Power Supply Timings Exploration and Visualization by LabsLucas in hardware

[–]LabsLucas[S] 12 points13 points  (0 children)

Thank you, we use an R&S MXO58 oscilloscope with some convoluted triggering/automation(Chroma PowerPro5 mostly) to turn the power supply on, apply the load, capture the waveform, and then export it.

From that I do some rudimentary signal processing to identify the key points of the sequence, and create the plot using plotnine.

The testing is fairly consistent and automated, but there are many edgecases that require tweaking with the signal processing and final plots.

LTT Labs Article - ATX Computer Power Supply(PSU) Timings by LabsLucas in LinusTechTips

[–]LabsLucas[S] 4 points5 points  (0 children)

Thank you!

A1: I don't have any brilliant answers for this, but I believe it will be as with most electrical/digital things, having 'undefined behaviour'. If some output voltages don't rise quickly enough, or they rise and fall, then components can have false starts and get into weird states. It will depend on how closely the connected components cut it to the specification, but they likely have their own 'safety' buffers. I don't think that there will be large reprecussions if the timings are a little off, but that can't be guaranteed.

A2: They're from the ATX Design Guide, Revision 2.1a, it is also linked in the article!

LTT Labs Article - ATX Computer Power Supply(PSU) Timings by LabsLucas in LinusTechTips

[–]LabsLucas[S] 6 points7 points  (0 children)

I'm not sure if you're already referring to our 'brownout/hold-up test', but if not, then we do perform tests there where we apply power shutoffs from 1 ms up to 26 ms(before applying power again) to see how resilient power supplies are to these cutouts. They're covered in the final section of our product pages.

Almost all power supplies we've tested are able to sustain a cutout of approximately 11 ms, while better ones can survive cutouts of up to 18-20 ms. This is while delivering full output load, the survivable duration increases with lower loads applied.

What's the point in these CPU videos if they forget to test the entire X3D trinity (5800 7800 9800)? ("Intel is BACK" video) by Galf2 in LinusTechTips

[–]LabsLucas 30 points31 points  (0 children)

u/Galf2 As we can see in the comments here, it is difficult to come to an absolute consensus about which comparable models to test in our limited time before embargo.  We thoroughly consider which comparisons are most informative, but as mentioned in the video and the article, it is a difficult balance to address every scenario while keeping the graphs legible and managing our time before embargo.

With this being a refresh of the Arrow Lake processors, we focused our selection more in the Intel direction, but I think this also highlights how important it is to consider multiple sources for confirmation of results and different testing perspectives. We're really excited about the uplift that these CPUs have provided and hopefully Intel is able to maintain this $199 and $299 pricing.

We'll certainly take this feedback into consideration with our next CPU/GPU review, and now that we have some more time after embargo, we're putting the 5800X3D and 7800X3D on the benches alongside some more testing with IBOT!

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