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The memory requirements for a witness server are actually not as bad as a "full node" or RPC node, since a lot of the plugins are not needed. 32 GB is more than enough with the current blockchain. A lot of witnesses are actually currently able to run with 16.

I understand, thank you @timcliff i run with 16GB but in my current position ( outside top 100 ) is hard to predict how much will i need, so this clarify it

16 works. I'm doing a little overkill since I can afford it and I don't want to ever miss a block over an easily fixed thing like amount of ram.

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