Personally, I don't think running 2 loops in 1 res would be much more of a difference, even if the flowrate is exactly the same as a single loop system.
The only disadvantage I see in this is that the water wouldn't be the coolest entering the block. But the water temp will be the most stable throughout the whole system.
In a single loop system, if the res isn't removing the heat fast enough, the heat in the res would just accumulate just as fast as is would in a 2 loop system given same volume of water in both systems.
So, what I see in a single loop system is a hot part and a cold part as you travel through the loop.
In a 2 loop system, the water will be the same throughout the whole system.
But, having a 2 loop system would make it possible to fine tune both loops to run at their maxium efficiency, making the overall system alot more effective than a single loop using the same rad and block.
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