Through GIGABYTE's custom intelligent controller, i-RAM acts like a regular SATA hard drive at theoretically 1.5Gb/s data transfer rate. By utilizing conventional DDR memory modules, i-RAM is outfitted with four 184-pin DIMM slots that will accept any DDR DIMM and support up to 4GB unbuffered / non-ECC memory.
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As you said,"iRAM requires a mirror on a hard drive",So how does this become faster than normal RAM?Why not just use hibernate feature in XP?
http://techreport.com/reviews/2006q1/gigabyte-iram/index.x?pg=1