No, because that would be an easily overcome hurdle by just adding a little extra silicon in each unit to ensure that it meets or exceeds the advertised capacity if the manufacturer were not in fact actually interested in being deliberately misleading. This thing appears to kind of be an exception, but even then they’re allergic to just outright stating the capacity.
If the manufacturers were interested in being honest with these types of things the “size class” would not so often invariably, unfailingly, result in a generous rounding up of the stated figure rather than rounding down.
TV’s are always smaller than their advertised “size class.” Appliances are always a lesser capacity than their advertised “size class.” Cameras always have fewer pixels than their “megapixel class.” Storage media is always smaller capacity than its advertised “size class.”
(And this is before we even get into the whole megabyte-gigabyte-terabyte/mebibyte-gigibyte-tebibyte debate.)
For mysterious undiagnosable seemingly hardware related issues, the power supply is always a good place to start.
Be aware that Dell has a nasty habit of using “proprietary” power supplies that have the pins switched around on the ATX connector, and thus won’t work unless you either buy one of their stupid OEM supplies or get a pinout chart and rearrange the pins on your new supply before you plug it in. I don’t know if that model is one of the ones that does this, so you might want to check first before you potentially smoke your board.
Every once in a while my machine requires cleaning, not just reseating, the RAM and/or video card edge connectors and slots for no readily identifiable reason. I have no idea how any kind of crud or oxidation manages to accumulate in there given that my PC never moves, it’s not in an especially humid environment nor one with temperature fluctuations, and as far as I can tell the air in here is acceptably clean. But it does nevertheless, and when it gets into that mode it will randomly reboot or blue screen with no rhyme or reason until I remember to hose everything down with CRC contact cleaner. I have to do this once about every 2-3 years. (Yes, I have had this build long enough for this to happen more than once…)