ok well for simplicity 1 resivior 1 big radiator a good heater core would probably do the job with a medium-high speed fan. now i wouldnt bother going out hitting a Y and comming back into another Y connection its going to add alot of resistance and your flow rate will hurt. if you were going to do that id recomend a danner 1200. personaly what i would do is get one large resivior 5-10 gallons install two pumps in the bottom one goes to each cpu then you join them at a single Y at the end of the loop just before the heater core.
now if you want slightly better temps than with the heater core you need just a few more parts and id say change that 5-10 gallon resivior into a bong which requires no Y joint at all just get two cheep walmart plastic shower heads drill out the flow resistor and mount htem at the top of a ~3' length of 4" pvc get a 4" pvc WYE(recomend double WYE) and mount that to the top of the resivior then have the cpu returns go to the two shower heads. now you just put medium-high speed fans in the WYE blowing in now for two cpus id say you will need atleast 60cfm of airflow id get two 40cfm sunons and put them on a double wye OR rig a set of 120's cus they are only slightly larger than a 4" opening so it would be easy to shroud them down so you could get a set of panflow 80cfms and have a total ambient noise from the fans at like 40dba. plus killer results from your bong cooler then you just need to make sure to fill it on a regular basis and also add about 1tsb of bleach per 1 1/2 gallon to prevent any bacteria forming.
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