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QuestionAsker

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  1. Hello everyone, In 2017, I bought a phone which happened to be Samsung Galaxy A5 2017 for $330. I don't use my phone that much in the day but I needed a phone with some degree of water resistance. IP68 of this phone has survived till now and I'm quite happy with it. Now it is time to look for another phone but I'm not able to find anything around that range or even under $450. It seems that manufactures have moved from useful features to useless ones. I don't care about dozens of camera and a screen that stretches from top to bottom if I can't use my phone in street on a rainy day. So what do you guys think ? Should I go for a non IP phone ? I have seen many liquid damaged phones around me in recent years and I'm a little concerned.
  2. Have you seen any VRM on your motherboard or GPU that brings down the voltage to 3.3V or 5V ? So if I put DC-DC converter inside the PSU for 5V and 3.3V rails where that specific redundancy is coming from ? If 3.3V or 5V were needed on any component in your PC that component will just use what PSU is providing ! I will provide an example, the ALC1220 chipset from realtek which is an audio chipset on my motherboard takes 3.3V on its first pin as VDD there is also an AVDD which takes 5V as input. Now how do you think my motherboard is providing this VDD and AVDD ? It converts down the 12V to 5V and 3.3V to power this chipset ? No ! there is no down converter on the board, it just uses the direct 3.3V and 5V that comes from PSU. I want to know about an example that a DC to DC converter inside PSU would be redundant. Show me a single component on motherboard or on a graphic card that needs a 3.3V or 5V and the board is using a down converter for that.
  3. I just registered here to say I wasn't able to understand why 12VO PSU is going to make any difference in efficiency. I will talk about some sentences from the video with timestamps : 11:22 - "converting from AC to DC power is extremely inefficient and conventional power supplied do it multiple times for the multiple voltages that they need to supply" Yes it is true and they do it because it is cheaper than having a AC to 12V DC converter and then a bunch of DC-DC converters but as you also said in the video some power supplies actually have that DC-DC converter inside them so this sentence can not be considered as a benefit of 12VO PSU. 11:58 - "to meet upcoming energy efficiency standards (some examples) intel and their partners went a step further that is why the 12V down conversion is taking place here on the motherboard rather than in the power supply because the higher the voltage the less conduction loss we are going to deal with over the runs of wire" This might actually be true but the difference is just nearly zero, I just used a multi meter to measure the resistance of a 50cm wire from my power supply and it was around 0.002 ohms and it is even funnier to know that the wire loss will actually get higher on full load and in idle it is just under 1 Watt. 13:02 - "So it works" No it doesn't ! I can easily see that the conventional PSU that you have used is not efficient not because it is not 12VO just because there is no DC-DC converter in it. So what actually bothers me is the unmentioned cost difference. The cost of that DC-DC conversion circuit on the motherboard is a lot higher than the whole Seasonic PSU you were using. AC to DC conversion is only optimal at a specific current/load and when you replace multiple AC to DC conversions with one AC to DC and then multiple DC to DC ones you get a lot higher efficiency at wider range of load specially idle. For those who actually care about efficiency, the future is for HVDC power grids. With high voltage direct current, the loss will be minimized in long wires and no low efficiency conversion is needed. Other solutions like 12VO PSU is just for annoyance of customers and nothing else. And in the end 12VO PSU just reminds me of a laptop power brick, it comes with a single DC voltage isn't it ?
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