Magma this week announced the immediate availability of ExpressBox4, an external PCI-Express Expansion box for desktop or laptop computers. Offering users four hot-swappable, full-size PCI Express expansion slots, the Expressbox4 connects to desktop machines via an existing x8 PCI Express slot, or to laptops via an ExpressCard slot. The ExpressBox4 ships with its own 400W power-supply, and is available in either desktop or 2U rack mountable version. Offering seamless integration (with the expansion slots appearing completely transparent to the host system without need of additional software), it works with Mac OS X 10.3 or later and costs $2,400.