The Tech Report has taken a look at Gigabyte's i-RAM. This is an add-in card that enables you to plug in four memory modules. It connects to a Serial ATA port and enables you to use the memory modules as a super fast hard drive.
Since it relies on volatile memory chips for storage, the i-RAM will lose data if the power is cut. Fortunately, the card can draw enough juice from a motherboard's PCI slot to keep its four DIMM slots powered, even when the system is turned off. The system does have to be plugged in and its power supply turned on, though.
To allow users to unplug their systems for periods of time and to protect against data loss due to a power failure, Gigabyte also equips the i-RAM with a rechargeable lithium ion battery that packs 1600 milliamp-hours of power. The battery charges while the system is plugged in, and according to Gigabyte, it can keep four 1GB DIMMs powered for more than ten hours.