express card to 2-port USB 3.0 with extra power supply

I have an express card with an ASM1042 chipset inside leading to 2 usb 3.0 ports with a 2 mm DC power socket for extra power. Despite powering in it with an 1 A, 5V supply it seems that it’s failing working with two hard drives plugged in. Once the second is plugged in, the first spins down and up and down again repeatedly.


We are only able to provide support for our Plugable-brand products. For support on your express card, you will want to contact the company who manufactured or sold the card to you.

Best wishes,