Power Supply with higher wattage for USB devices

[wakakur]

Hello, I'm new here but quite a patron of the forum. My current desktop PC power supply is the typical 600 Watts.

1. If I replaced it with a new one of greater wattage like 700 Watts, will such higher Wattage benefit inserted USB devices? I often have all my USB ports occupied at the same time with different portable hard disks and other devices, and sometimes one or two of the connections drop.

2. Also, does the higher Power Supply Wattage increase power consumption (electricity bill)?

Thanks in advance, friends.

 

[J_E_D_70]

No it shouldn't help as the mobo regulates the power to the usb ports, unless your psu's 5v rail is not working correctly. The 600w you have should be plenty for any system unless you have dual
Gpu's.

 

[Rogue Leader]

A higher wattage PSU may provide more wattage to the 5v rail, but unlikely since its not expected to be filling every USB port with something that needs that much power.

Instead of replacing the PSU why not buy a powered external USB hub to run your higher power USB devices. That will solve your problem.

 

[Karadjgne]

Sometimes a larger psu will have slightly larger amperage on the 5v and 3.3v rails, moving from @20-25A to 25-30A. However, this is offset by the motherboard only being able to supply the USB buss with so much power. You might never get close to that 30A possibility. To top that off, most USB ports run @2A max, there are a few motherboards that will specifically allow you to use 5A to charge apple products etc, and are often associated with 1 particular port that's also run through software, like MSI Fast Charge.

So, for extended USB items, best course of action is a powered USB hub, where I/O is still handled by the motherboard port, but power is not from the USB port itself, but molex or Sata or the wall outlet.

Oh. A psu will only use as much power as demanded from it, offset by efficiency. If your pc has a 300w draw, you would see the same amount of electricity used on a 400w psu, as a 1200w psu. About 380w from the wall at 80% efficiency.