As a rule of thumb some people say no less then 2 GPH per w produced by the CPU. I find that thats a little too low.
For a 3/8 inch system w/ TBird I'd say ~200-250GPH would be fine. Use 1/2 inch tubeing and more is always better. Use a cooler CPU and less will do fine.
In my case I went with the 317GPH 1250 because it was $9 more and I wanted to leave GPU/NB blocks as an option later on. I'd be worried aout using 3 blocks on a 1048.
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