it depends on the mobo as to how it deals with mismatched RAM. I believe most will lower the higher to the lower and go that way, others will silently reject one, others will noisly reject the whole lot.
as for fedora... there is no rule really.. i'd probably give it 512mb, but if space is no issue, then more never hurts. don't pay attention to any hard fast fast rules like it should be double your RAM etc.. this isn't 1987 any more.
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