I have the same radiator that DogeViper does (just without all the extra barbs
) on its side and I dont ahve a problem with that. Personally I think it helps to reduce resistance on the whole system becuase the water is constantly moving up instead of having to flow down and then be pushed back up to the top of the radiator THEN throught the rest of the system. My theory.......
DodgeViper: you realize that we both use: the Eheim 1250, TC-4, Dtek Custom Radiator (same color even), and now the same MB......... now either we both know how to build water cooled super computers or that is just a weird fluke!