Water-cooled power supplies - Never heard of that before!
Pedantry aside, the magnetic mount doesn't hold the block to the CPU, it holds the bracket to the block and thumb screws tighten the whole affair to the mainboard, whether you're Intel or AMD.
Oh and I google'd magnetic mounting issues regarding the i-series hydro-coolers. Guess what, I went through 5 pages and found nothing.
Well spotted, I typo'd that something terrible.
And yes fair enough, I meant the entirety of the mounting gubbins when I said 'magnetic mounting issues'. I suspect that you did not find anything because most people would not have experimented enough to discover what the problem is before returning it. I have experienced the problem with two client builds, and both units have gone back (both were H60 V2's), there was a chap with a H100i on here who had the issue (if I can locate the thread, I will come back and link it), and I was in contact with someone through YouTube who did a video installation of an H100i and his temperatures seemed way too high.
It is not a case of not tightening it enough, the screws were tightened so much that I was at risk of stripping the heads, so I stopped tightening them. The nuts on the backplate also twist when you tighten the screws, on both occasions I had to hold them with pliers to even get the screw to catch and tighten properly without everything spinning endlessly.
In each case, pressing firmly down on the CPU block drops the core temperatures drastically, suggesting that it won't seat properly. Some people have placed rubber washers under the backplate to tighten the fit.
I have emailed Corsair about the matter recently, and I am still awaiting a response.
http://www.overclock.net/t/1366127/corsair-h80i-mounting-question
http://forum.corsair.com/forums/showthread.php?t=115960
(makes reference to bad mounting)
http://forum.corsair.com/v3/showthread.php?t=114672
http://www.overclock.net/t/1361216/corsair-h100i-high-temps
(makes reference to bad mounting)
http://forum.overclock3d.net/showthread.php?t=51656&page=2
(makes reference to possible mounting issue)
I could find tonnes of links, but I won't bore you
There are seemingly endless forum threads about it. Even those which dont report bad mounting, state that the pump and fans are incredibly loud, I assume due to them desperately trying to cool the CPU - over-compensating for the bad mount of the block...
It seems that some units have no issues, some have issues with mounting but with blood, sweat, tears and persistence they will mount properly, and still others wont mount properly at all. I suspect that there are many people out there who are using these coolers with the issues, and simply don't know that the temperatures are too high. The chap I contacted through YouTube for example said "I thought the temperatures seemed a little bit high, but I assumed that they must be normal or I was doing something wrong. I'm glad you let me know though, otherwise I would have left it"