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I think that's the idea of moving to 8 downstreams - doubling DS capacity, upstream bonding, and node splits left right and centre. I think the quetion you want to ask is will enough capacity be added - we both know plenty of capacity is being added :-P

So far as the 20 to 30mb goes, the users would be getting moved from a bunch of single 38mbps downstreams onto a bonded 400mbps downstreams, and thanks to the rules of statistical contention, should receive far better service as a result (you saw yourself the improvement associated with going onto a bonded 200mbps DS). However downstream capacity isn't an area where VM are particularly weak, outside of a fault situation, upstream is usually the big problem.

Still, I've always thought 50mbps down a 200mbps pipe was a bit of a tight squeeze and 100mbps to be borderline insane, so the move to 8 downstreams should improve matters more than would be expected out of direct proportionality.