Question regarding multiple cores
 

I recently accquired an old IBM S702 server case that I intend to mod to a water cooling rig. Lots of room, so a question has crossed my mind regarding mulitple cores. I actually have enough room to mount 2 single pass Fedco 2-342 end to end. I would think this would allow me to flow 4 fans at a near silent rate. Since this will be my first water cooling rig, can I expect an appreciable gains over the same setup with just one core?

No. ;)

The difference will be minimal, maybe a couple of degrees at best, that'll depend on the airflow.

I would disagree.. but not completly.. guess i'll have to explain that..
As u said Ben it depends on airflow..
If you double the heatercore space but decrease the airflow by 50% would that not be roughly equivelent? and decreasing airflow decreases noise...
I image there are mathimatica equations that will prove this idea wrong on a larger scale.. eventualy there will be a point of dimminishing returns...
my 2¢

That's right (thanks for the correction).

As for the math formulae, it'll be a cold day in hell before we get our hands on that! ;)

as for hooking up 2 cores...
I recomend hooking it up in parallel.
that way you could maximise your flow.
my 2¢