How do U attach that one to S5 ? Do you remove casing ?
Yes, the casing is removed. And this fan is RPM controllable. I'm not sure why the casing is on there. I'm not familiar with any setup that would use the fan with this casing. For all I know, it may just be to protect the fan during shipping.
By the way... I've bought
over a dozen of these fans from this seller on Amazon. They are a good seller. Free Shipping for that fan as well.
I use them in S4's, S3's and S5's. I bought more of them to replace factory fans in the SP20's as well. Of course, I had to buy a different connector to be able to connect this particular fan to the connector in the SP20's...
http://www.ebay.com/itm/161350482183?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT