You know, that might work well if you tuned it. If the radiator pump was too fast, you would be adding too much heat from an oversized pump. The key would be to ensure that water coming back from the waterblock did not go right back. The hot water should be near the radiator pump intake.
Frankly, I think it is difficult to get this one right because of the increased complexity of the heat paths. I think you'd be better off using a larger pump with radiators in parallel if you have problems with cooling your current CPU.
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