Designed for use in the Dell OptiPlex 755 PC, this Dell DR845 socket LGA 775 motherboard is compatible with Intel CPUs. The Dell motherboard also supports Hyper-Threading Technology from Intel, which helps in allocating system resources more efficiently and delivers faster, smoother processing. The four dual-channel DIMM slots in this socket LGA 775 motherboard allow for up to 8 GB of DDR2 RAM running at 667 MHz or 800 MHz for 64-bit systems, and a maximum 4 GB of RAM for 32-bit systems. Equipped with an Intel Q35 chipset, the Dell motherboard also offers integrated graphics and high-definition audio cards. A built-in VGA port allows for connecting a monitor, while line-in, line-out, as well as headphone and microphone ports support the built-in sound capabilities of the Dell DR845. In addition, this Dell motherboard offers multiple USB ports for connecting external devices, a nine-pin serial port, a 25-hole parallel port, and an integrated LAN interface for wired Internet access. PCI Express, PCI 66, and PCI slots also allow users to expand the system's capabilities for added functionalities.