QUOTE(eatsleepnDIE @ Aug 5 2015, 10:28 AM)
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sifu wanna ask, what is the different between Acetal+Nickel waterblock and just the Acetal waterblock? i read it is the same performance is it true? do i need the anti corrosion coolant?
and on ek website, it says the block designed to accommodate a weak pump, so if i want to cool just my gc, suffice for me to get the cheapest and weakest pump right?
thanks in advance
not really an expert but i am vaguely aware of the galvanic issue

QUOTE
Even liquid with a corrosion inhibitor won't last long. You'll likely be changing coolant very often. It's best not to use them together at all.
The most damage would be to the aluminum radiator, not so much the block (which is unfortunate, because you can't see the damage inside the rad). Eventually, you'll probably end up with pinhole leaks in your rad.
I'd recommend getting a copper radiator or a nickel plated block..... or a lot of anti-corrosive liquid.
Liquid usually turns into a milky color when corrosion is occurring in your loop.
http://www.overclock.net/t/1222245/how-to-...orrosion-alu-cui'm using a copper radiator and cpu waterblock
1 x Feser X-Changer Triple 360 mm Extreme Performance Radiator - 15mm Spacing

1 x Swiftech Apogee XT CPU Waterblock

unfortunately when i bought my 680gtx waterblock i forgot to check the metal type.... i ended up getting/using a nickle/acetal. however thankfully...
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There is no difference really.
Nickel plated and full nickel are the same thing just worded differently.
Acetal is a type of plastic that the top is made of, it will either be acrylic or acetal.
EN nickel is a newer type of nickel plating that EK uses and is supposed to reduce the likeliness of the nickel flaking.
Copper and nickel are almost the same chemically so there isn't any problem mixing them.
EK only sells EN nickel now as they had some major problems with the nickel plating flaking off.
Some people will say not to use EK due to the nickel flaking problems which still seems to happen sometimes with the EN but I have had no problems with mine (running since May)
http://www.overclock.net/t/1342447/differe...and-full-nickel 
phew dodged a bullet
anyway i use plain distilled water.
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Distilled water is water that has many of its impurities removed through distillation. Distillation involves boiling the water and then condensing the steam into a clean container.
i prefer a simple setup. Sure i could have put anti rust, but that takes maintenance to change out..... and even worse is colored coolant because overtime it becomes gunk like slimish. Needs to take out the whole radiator to shake out the slime, and replace......
thats why simple effective setup is best.
I use 2 of this 99.9% silver kill coil inside my water reservoir to prevent algae from growing

and this tygon silver lined tubing

water cool cpu and gpu makes the most sense. you can reduce the rev up noise from fans when pc is underload.... also good for pcs like mine which is left on 24/7
and even though i use 6 radiators on my radiator, i set to low medium, can hardly hear pc make noise at all