I'm not sure about that. When you take less memory you need more passes. I think it's just the time that matters.
If you take 20 passes with 1 Giga or you take 20 passes with 4 giga. The time to finish the 20 passes with 4 giga is much longer so you have more chance that it fails.
With 80 passes of 1 Giga the time to finish will be the same and you will have more chance of failure.
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