Quote Originally Posted by saaya View Post
I finally found the link i was looking for before when people discussed galvanic corrosion when mixing copper and alu in a loop:

http://www.overclock.net/water-cooli...waterloop.html

left is copper and alu mixed, right is from pure copper loop.
Both blocks have been used for YEARS as stated by the thread starter.
I assume they were used for 2 years, and probabaly with some additive to prevent corrosion. So like i said earlier, there will be corrosion, but it will be negectible... unless you plan to use your waterblocks for 5 years or more and care that they keep that shiny "like new" look.

That is not true, while the one on the left looks like it has just a little corrosion, the problem isn't only there. Galvanic Corrosion causes a layer on the top of the block, reducing how well it works. Imagine a EK Supreme, that uses it's micro-channels to help cool the metal. If there's a thin layer of less conductive crap on it (not to mention the fact that the additive lowers the conductivity of the water), then it's not cooling nearly as well as it should.

It's like running an engine on oil that is 15,000 miles used. Yes it will work, yes it will lubricate, but it's not doing nearly as good as it should. It can lead to blockages and the raised viscosity of the crud infested oil makes the engine work harder to do the same amount of work.

Personally, if I'm spending that much money on cooling, I don't want to include things in my system that will lower it's cooling potential over time.