While there are subtle differences between two-banks DIMM and two single-bank DIMMs (related to refresh as you've correctly pointed out) from software point of view they are more-or-less identical. I think this is why it was omitted from article. And the question "what the hell does latency 2.5 mean?" is common (less so today when DDR is almost history and DDR2 is mainstream, but still) so I think few lines are worth it...
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