Flash is not the same thing. It works the same but is built on a newer technology. The first ram drives actually had sticks of sdram ram, and 1/2 a gig was huge. today they use ddram and go up into the tarabite range.
Quote:
Entry-level Solid State Disk
For the RamSan-120, the key word is small- small in size, small in price, and ideal for accelerating the small capacity database, database log or email queue. But while the 1U RamSan-120 is small, it is also powerful. The RamSan-120 provides two 2Gbit Fibre Channel ports capable of over 70,000 random I/Os per second and 400MB/second of bandwidth. Because the system uses DDR RAM for storage, the latency for data requests from servers is under 20 microseconds.
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The little drives I have predate flash, sodimm I would think based on age and IDE 33 standards marked on them.