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>First, this already happened to some extent. Fujitsu have been building PCs for a number of years with proprietary 12v-only PSUs, with SATA power being provid

• DiabloD3 7y ago
  Modularized redundant server PSUs are usually built this way: the modules are 12v only, and dumb as bricks, with the 3.3v and 5v supplied by the PSU's backplane; unfortunately, this leads to server failure because of backplane failure. Some SAS backplanes for cases that fit a bunch of drives sometimes have their own 5v VRMs and take only a standard 12v connector of some sort. Helps when PSUs typically don't supply enough 5v to feed a few dozen drives, but supply more than enough 12v.
• close04 7y ago
  Basically every OEM small PC (everything below SFF from Lenovo, HP, Dell, Fujitsu, etc. which do not accept PCIe extension cards and are pretty much built from laptop parts) is now powered from laptop brick PSUs. Which means everything inside the desktop is derived off of a single 19-20V DC line. SFFs still use internal PSU but they're all custom and while I haven't opened up one recently I'm sure they dropped as many of the rails as possible since they have full control of the MoBo/PSU design. The only PCs that use ATX PSUs are full towers in general.