The USB 2.0 adapter provides a DE-15 VGA slot.
A USB 2.0-to-VGA display adapter allows a user to connect an extra monitor to the computer through USB 2.0. The monitor connects to the VGA port on the adapter. The adapter connects to a USB 2.0 port on the computer.
Configuring dual displays on a system can increase productivity and improve a user's ability to multi-task. However, connecting a monitor to a USB 2.0-to-VGA display adapter can have its drawbacks.
USB 1.0 vs. USB 2.0
USB technology is backwards- and forwards-compatible: USB 2.0 devices can connect to USB 1.0 slots, and visa-versa. However, USB 1.0 slots do not provide the same data speeds as USB 2.0. USB 1.0 processes data from 192KB per second to 1.5MB per second. USB 2.0 processes data as fast as 60MB per second. A computer installed with USB 1.0 will not support a display adapter due to the differences in speeds.
Video Interfaces
Monitors use one of three technologies to connect to a computer: VGA (video graphics array), DVI (digital video interface) and HDMI (high-definition multimedia interface). VGA outputs analog video, DVI outputs digital video, and HDMI outputs high-definition digital. A monitor requiring DVI-A (DVI-Analog) or DVI-I (DVI-Integrated) can connect to a USB 2.0-to-VGA dual display adapter through a DVI-to-VGA adapter. But DVI-D (DVI-Digital) monitor requires a DVI-to-VGA converter box to connect to a VGA port. Some HDMI displays include a VGA port, but not all do.
PCIe vs. USB 2.0
Modern graphics cards connect to the computer through a PCI Express x16 slot on the motherboard. PCI Express 2.0, or PCIe, can process data at up to 8GB per second, unlike USB 2.0, which only processes data at up to 60MB per second. A monitor connected to a USB 2.0-to-VGA video adapter will display a picture of poorer quality than a monitor connected to a PCIe graphics card.
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