I bought these RAM coolers, and fan which I bought from NCIX.com
I think they would do a great job of cooling off the FB-DIMMS. The reason I chose them was because I saw a youtube video of a guy building a Z7S build, and this is what he was using, so they must fit FB-DIMMS. I really don't think there is a physical size difference between DDR2/DDR3 and FB-DIMM.
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