Is it possible to turn almost everything on a Raspberry Pi off (CPU GPU etc), except for the ram?

Basically putting the Pi in a low power state but preserving whatever it was doing at the moment on which it was turned off?

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    Isn't that called "Sleep"? – Harry Svensson Dec 12 '17 at 19:35
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    Do not be sorry. It is actually better to keep the topics separate. You did right. – Trevor Dec 12 '17 at 19:42
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    Rasp may not be the right CPU for what you are considering. How much RAM are you thinking about anyway? – Trevor Dec 12 '17 at 19:45
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    Hi, my original plan was actually to have a separate device which would store the data and have the program that generates the data run on the Raspberry Pi, but I have now learned that building such a device is very difficult so I thought about having the Pi save the data to it's own RAM and keeping only the RAM enabled when a low power state is needed, but it seems like that is not possible and the Raspberry Pi doesn't have enough RAM, I need 2 gigs. I think I underestimated this problem and there is no easy solution. – adjustt Dec 12 '17 at 19:53
  • how fast is the data being generated? can you use a usb flash drive for storage? – jsotola Dec 12 '17 at 20:00

No, the DRAM needs to be refreshed which is not a function you can run independent of the GPU. It is all or nothing.

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    Actually, most modern DRAM chips do have a self-refresh mode. But it must be explicitly entered before shutting down the rest of the system. – Dave Tweed Dec 12 '17 at 22:40

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