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We all know that RAM is alive only when it is supplied by power, because the data need to be refreshed every couple of milliseconds. My question is, if there are any RAM units for regular PC's that have some kind of "autonomous" power system (battery or other power supply) which is independent of the power output of the whole computer.

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Good question, there's a patent for it google.com/patents/US7836339 –  BigHomie Apr 16 '13 at 15:33
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Here's one such product –  David Schwartz Apr 16 '13 at 15:33
    
@DavidSchwartz, that appears to be more of a UPS for RAM... –  AthomSfere Apr 16 '13 at 15:47
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@AthomSfere: Yes, a UPS is an autonomous power system run by a battery. –  David Schwartz Apr 16 '13 at 16:18
    
is this just out of curiosity? or do have a problem you are trying to solve? –  Keltari May 7 '13 at 19:54

2 Answers 2

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There were some devices such as ACARD ANS-9010 DDR2 SATA RAM-Drive that have autonomus power for RAM.

The idea was to have a hard drive made from volitile ram and be able to store your OS on and features an onboard rechargable battery. Acard

There is also the iram with similar concept in battery use.

Not sure these are still in circulation or not, the idea is several years old and seems to have died with the availablility of the SSD.

iram

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RAM is useless outside of a von Neumann machine, so I would imagine any autonomous RAM system would only serve to test the RAM, and would therefore need a CPU and I/O devices... a typical computer.

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