thanks for the post waterlogged...I had read that found it useful. The information in it essentially proves that the size and shape of water radiators in cars is indeed very suitable. The major concern is flow and pressure drop and the effect of mixing metals.

- In regards to the flow I do not have a problem, the sheer size of the radiator will be sufficient for passive cooling and the size is just perfect to be mounted against the wall.

- In regards to the galvanic corrosion I gather that G12 is suitable. The ratio should be higher than 1:10 leaning towards 3:10 or as you suggested even 4:10.

I would like to have some info on the effects of possible effect performance wise of that mixture on my loop (planned loop).

+ if everything is going to be allright and I indeed achieve a very good dt between idle and load I might try using a 600w peltier module I found on ebay ( http://cgi.ebay.it/CELLA-DI-PELTIER-...742.m153.l1262 ). I should easily get sub-zero temps and with no fans( the x1950 pro will get passive cooling - I will not be playing games in a while with exams coming up)