The name Radu is of Romanian origin. The meaning of Radu is happy. Radu is generally used as a boy's name. It consists of 4 letters and 2 syllables and is pronounced Ra-du.
The Northbridge is the portion of the chipset HUB that connects faster I/O buses (for example, an AGP bus) to the system bus. Northbridge SI also bigger looking then the Southbridge chip. The Southbridge is the HUB that connects to slower I/O buses (for example, An ISA bus) to the system bus.
In Intel's last several CPU families, the northbridge connects the CPU to other components that run at or near to the same speed as the CPU. This would be things like the GPU and memory. The southbridge is connected to the northbridge and is used to connect slower-speed devices like USB ports and SATA ports. These operate at a fraction of the speed of the CPU.