Probably not. The pump in those things might not be enough to get water through 5 different blocks, and even if it was, that's a lot of heat to be dissipated by passive cooling. It might work if you have a 20" floor fan pointed at it, but other than that, I'm not sure it would be able to cool all that.
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Currently using one large rad, two gallons of coolant, and two 13.5 inch fans to cool my car's engine. 
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