If you run everything in series, your CPU temps would at most increase by 1-2degC. It all depends on the cooling efficiency of your Rad. The more heat your rad is capable of handling, the lesser the performace hit.
The MCP-600 is a more than capable pump for your setup. Adding another pump may increase the flow but might not necessary improve performace. What I meant by improved performanced is an improvement in O/C ability and not a decrese in temps. If your CPU has hit a wall with the Cascade based on your current setup, it is unlkely that the hassle of putting in another pump is gonna benefit u.
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