[url=http://www.tomshardware.com/news/Transcend-LRDIMM-Memory-RAM,21444.html#xtor=RSS-998]Source (Tom's Hardware)[/url]
The catch is that your motherboard has to have 24 RAM slots...still though.
Who on earth needs this much RAM????
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I had an old PowerMac with 8 slots. The max you could put into each was 128MB. I had a whopping (for the time) 1GB of RAM.