The only 'buffer' you might want ot consider is the static water mass in the CPU waterblock. In the case of a coolant loop / pump failure it's what will make the difference.
Now for a res in the coolant loop. It's only a 'capacitor' if you make the electrical analogy. It wont change your min/max temps (unless the res itself is cooled down, like a chiller or a rad) but just 'delay' them.
My personal taste goes to a small bubble trap ala Turbokeu. I like hauling my PC to LAN parties.
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