Joseph99 :
SO your saying don't stick the RAD inbetween the fans? like stick the fans beside the RAD?
The rad goes inbetween two fans.
This is the way a H80i and most liquid cooling loops work, here's the stock image for the H80i:
http://www.corsair.com/Media/catalog/product/h/8/h80i_hero_fan.png
Note how there's a fan at the back, the radiator, and then another fan at the front. This is known as a Push Pull setup. A radiator is a means of spreading out heat across a surface, the fans then carry that heat away from it. However, radiators need some high-static pressure fans to pull (or push) the air through the fins of the radiator itself as obviously, it's not completely hollow. The ones that come with the H80 do this just fine.
A push pull setup is needed for the H80i because it's quite a thick radiator and one fan isn't ideal to get the air through it, although it does cool adequately with one, it's just not that great. Push/pull refers to the fan orientation, one fan will
push air from one side through the fins of the radiator and the other will
pull that air through.
You have two options with the H80i fan orientation. You can have the fans facing the rear of the case (So, the front of the fans, the bit without the wire coming out of the frame, will be facing the back), in a setup where the air moves like this:
|| -> Air comes in from the back. |RAD| -> Air gets pulled into the case, through the radiator.
Generally this will give you slightly lower temperatures because the air cooling your radiator will be coming from the fresh air outside the case. However I don't recommend this setup because it also sucks in dust/fur/ or anything else, and it's impossible to clean without completely unscrewing the radiator for cleaning.
Or, you may mount it so it grabs the air from inside the case and pushes it out the back, the fans would be mounted in the same way they are in the picture. In my opinion this not only looks better, but it doesn't expel more heat into your case and doesn't suck in dust and fur. Like this:
|| <- Air gets pulled through the rad and sent out the back. |RAD| <- Air gets pushed into the radiator, from the inside of the case.
That's generally the jist of it. As said above you can get a super slim fan if you really want that one at the top, but usually they're not very effective and I don't see much point.