10LBs ought to get you 2-4 hours, I'd say. Not that I've run a FX on DIce.
Did run a 980x, that's similarly high draw. While running the more intense benches I think it ate 2LBs/hour or so. Running CPUz / spi1m was less so of course.
I'd start with a 10lb sack, if you run out it doesn't cost you money. If you buy way too much, it costs you money.
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