There are Y cables which connect to two USB A pins. You could connect the second cable to a wall power supply and that would at least get you another 500mA. So, using a Y cable (and an extension cable to bring the wall adapter close to your PC) that should allow for 1.3A.
I have not done this before, as a USB 3.0 port allows for my RPi4 2.0GHz overclock to run just fine (as I don't stress it).
One successful case of using a Y cable:
viewtopic.php?t=244654
Its really not a good idea paralleling power supplies, you are relying heavily on the resistance of the leads to even things out, if the leads were zero resistance or no leads were involved, only one power supply would initially try to take the load, but then if the load is too great and its current limiting kicked in, the other power supply takes the load and an oscillation can take place because the response rate to rise and falls in voltage are not the same, further complicated by two different models of power supplies.
Even if it appears to work, a mains spike or sudden load change can trigger an undesired reaction, there is no guarantee of stability, the circuitry is not designed for that unless specifically stated.
Some power supplies don't like backfeeding and won't start up at all if there is voltage on its output.
Statistics: Posted by pidd — Sat May 18, 2024 5:42 am