Unidentified USB header for Dell OptiPlex 3020
I checked the image you shared—it matches the appearance of a USB 2.0 header. Yes, it confirms it's a USB 2.0 header.
It mentions INT-USB beside it, but it looks better if USBF1 appears above it. Likely it's a USB connection.
It mentions Int-USB.
Typically, Dell uses specific color codes for their internal connectors. You might find a generic blue cable with a female connector nearby.
I purchased it secondhand.