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Based on my experience selling USB 3.0 PCIe cards, the ones that supply 5.0V directly off the PSU are more likely to maintain voltage at higher currents than on
by jacob019 7y ago
Based on my experience selling USB 3.0 PCIe cards, the ones that supply 5.0V directly off the PSU are more likely to maintain voltage at higher currents than ones with an on-board buck circuit. And it's one less part that can fail. I have not seen much in the way of stability issues either. The 5V from the PSU is clean enough and voltage drop is minimal at these currents over the standard 18 AWG PSU wires.
- DiabloD3 7y agoGenerally the ripple is audible on USB-powered audio devices that don't use isolated 5v rails. The ones that don't have audible issues either have their own VRMs on the boards or they have a sufficiently isolated 5v rail but still use PSU power. A good board should not have issues even under extreme cases. Neither solution is particularly more expensive than the other. If I need to maintain voltage without droop under high load, I probably should be looking at legitimate chargers, not something powered off the computer.