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In case anyone thinks JayzTwoCents' video about power supplies is accurate...



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  • In case anyone thinks JayzTwoCents' video about power supplies is accurate...

    I already have people on Reddit saying "you're wrong, I'm right because I watched a JayzTwoCent video"......

    1:45: Actually, 230V isn't harder to "step down" than 115V. You're supposed look at the CURRENT. And 230V is lower CURRENT because it's twice the VOLTAGE of the U.S. So, it's actually easier and cheaper to make a PSU that is "230V Only" (example: Cooler Master MWE 230V) because you can down size the primary components by as much as 50% since they only have to support 50% of the current.

    8:47: All the fans are about the same size, Jay. You can't put bigger than a 140mm in a PSU housing.

    8:58: That power connector is not proprietary. It's called a C20. It's made to handle upwards of 16A instead of just 10A which is what the C14 we see on lower wattage PSUs is rated at.

    11:08: It's not actually a "bell curve", or typically isn't any more. You're example is, because it's an older platform using an older, cheaper topology, but newer, better PSUs tend to use switching technologies that "flatten" that curve. Typically the only "curve" you'll see is below 10% load. This is why you'll see that the newer 80 PLUS reports actually include a 10% efficiency requirement. And the newest Intel spec calls out a 2% efficiency that requires a PWM controller that goes into "burst mode" to achieve this higher efficiency at these lower loads.

    11:13: The PSU is only getting marginally hotter by being run at higher load. Most of the heat it should be getting is from the components its powering and components like MOSFETs actually become more efficient as they get hotter. So what you'll actually see is a "bounce back" at the higher load. Google "MOSFET Parameter Shifts Near Maximum Operating Temperature" or something like that.

    11:51: Actually, not all PSUs today have OCP. To have OCP, you need a 14-pin supervisor IC. To have multiple +12V rails, you would need an even bigger IC, an MCU or multiple supervisor ICs (example: Corsair HX). If the PSU only has a 10-pin supervisor IC (example: Gigabyte GP-P750GM) you DO NOT have OCP and have to rely on OPP, which is on the AC side of the PSU and is considerably slower to react than OCP.

    15:52: No. They're not. There's a lot of OEMs out there, and more than half the time, the "brand" (Cooler Master, Corsair, beQuiet to name a few) have their own engineering teams, so even if they come from the same OEM, they're not going to equate to "the same power supply". Even if you start with a core platform, you can change the components on that platform to obtain or improve different features, or remove them completely to make the PSU cheaper. Sure, a smaller company like NZXT or Fractal will just walk up to Seasonic and say, "can you make this look like an NZXT or Fractal product", that's not usually the case.
    Last edited by jonnyGURU; 03-20-2021, 10:20 PM.