I'd thought they were stuck at 10 watts consumption and it wasn't the power supplies, it's real likely the USB 2.0 is set to consume that much,
Here's a random low-priced USB 2.0 converter with power supply. I have a Thin Client that needs 5v for the new USB 3.0 PCIE card, and 5 and 12v to run a 3.5" hard drive. At first I tried an older ATX power supply, short green pin to ground and hooked up. Right away the USB reports on screen "over current, shutting down for safety". I was worried I burned the card out so I tried my adapter power supply with 2 x adapter and voila, works ever since. Happened to be plugged into my watt mater, so the watts have peaks and valleys (4-8w is normal) but the power supply runs cool.
So now you know, the standard cheap one-trick-pony power supply can be a very useful investment in it's own right.
Here's a random low-priced USB 2.0 converter with power supply. I have a Thin Client that needs 5v for the new USB 3.0 PCIE card, and 5 and 12v to run a 3.5" hard drive. At first I tried an older ATX power supply, short green pin to ground and hooked up. Right away the USB reports on screen "over current, shutting down for safety". I was worried I burned the card out so I tried my adapter power supply with 2 x adapter and voila, works ever since. Happened to be plugged into my watt mater, so the watts have peaks and valleys (4-8w is normal) but the power supply runs cool.
So now you know, the standard cheap one-trick-pony power supply can be a very useful investment in it's own right.