Coincidentally, the USB-C spec is written such that wattage implies a minimum set of supported voltages:
* ≤15W charger: must have 5V
* ≤27W charger: must have 5V & 9V
* ≤45W charger: must have 5V & 9V & 15V
* (OT but worth noting: >60W: requires "chipped" cable.)
* ≤100W charger: must have 5V & 9V & 15V & 20V
(levels above this starting to become relevant for the new 240W stuff)
(36W/12V doesn't exist anymore in PD 3.0. There seems to be a pattern with 140W @ 28V now, and then 240W at 48V, I haven't checked what's actually in the specs now for those, vs. what's just "herd agreement".)
Some devices are built to only charge from 20V, which means you need to buy a 45.000001W (scnr) charger to be sure it'll charge. If I remember correctly, requiring a minimum wattage to charge is permitted by the standard, so if the device requires a 46W charger it can assume it'll get 15V. Not sure about what exactly the spec says there, though.
(Of course the chargers may support higher voltages at lower power, but that'd cost money to build so they pretty much don't.)
NB: the lower voltages are all mandatory to support for higher powered chargers to be spec compliant. Some that don't do that exist — they're not spec compliant.
It's a 3A supply up to the 100W one, that gets upped to 5A at higher voltages.
Varying voltage power supplies are usually capped by current, not power. That's because many of the components, set maximum current and voltage that you must obey independently.
At higher voltages people start accepting higher loses in stuff like cables, because fire-safety becomes a more important concern than efficiency. So the standard relaxes things a little bit.
You're correct but it's irrelevant. My point was that these requirements are in the standard and if you want to put the USB logo on a power brick you need to meet them. And the consumer is intended to be able to rely on them - which was & still is a pretty good idea considering the USB-C cable carnage.
I wish they did something like this for USB-C cables, but it's probably too late.
This has nothing to do with USB-C, this is the minimum design voltage of your lithium ion battery pack. In this case, you have a 4-cell pack, and if the cells drop below 2.895V that means they're physically f*cked and HP would like to sell you a new battery. (Sometimes that can be fixed by trickle charging, depending on how badly f*cked the battery is.)
If your laptop's USB-C circuitry were built for it, you could charge it from 5V. (Slowly, of course.) It's not even that much of a stretch given laptops are built with "NVDC"¹ power systems, and any charger input goes into a buck-boost voltage regulator anyway.
..you forgot to mention that any technology in China, foreign or domestic, can and will be used for and to the benefit of the -military- party.. But like someone posted: "not perfect" fits the bill.
Check out the Sean Ryan Show with Palmer Luckey on China and military tech.
Thanks for sharing all those experiences and tech explanations in how tractor clutches work everyone.
Great thread to read. I'm kinda surprised the OP made the HN tops but DIY anything seems to be experiencing a Renaissance. (Not too big a surprise in HN I suppose)
I'm starstruck. Honestly sad but not surprising since we live in the age where attention is a currency anything will be done to attempt to buy attention.
Just look at how many cool and legit open projects have the star-meter graph in their README.md - so of course people will start measuring against that metric and start gaming it.
I was surprised myself when I suddenly saw a starstruck badge on my profile. I never advertise my projects but I do feel honored when people think that my contributions are useful and stars are an easy way of showing that gratitude. At least I think that's how it was intended. And now someone is breaking that for scraps (or not scraps.)
This is exactly the bs that pushes services to not offer their own logins anymore, now you have to login with FB or GH or $randomFamousSvc instead of the more anonymous "by email" - just happened to me recently when I wanted to use a trial account, but I totally get it - with abuse trust is substituted with control. It's the same everywhere.. even voter ID.
Sorry, that went off track. I guess just don't look at the stars anymore. Wait, no, don't do that, stars are beautiful and so are you if you read all the way to here. Here's a * for you :)
Totally agree with you. What a shame. But when I look at the national debt that seems even more out of reach, I do tend to consider that maybe the stars should wait till we have our s..tuff together here on earth. Privately funded, no issues, go for it at warp speed!
im currently running a custom Gemma4 26b MoE model on my 24gb m2... super fast and it beat deepseek, chatgpt, and gemini in 3 different puzzles/code challenges I tested it on. the issue now is the low context... I can only do 2048 tokens with my vram... the gap is slowly closing on the frontier models
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