I found on http://www.noctua.at/main.php?show=compatibility_ram_gen&products_id=34&lng=en#DDR3_Corsair
that this RAM is not compatible
I need low profile RAM, but Corsair does not have 1866MHz sticks
Maybe there are some other brand DDR3 RAM 2x8GB sticks of 1866MHz CL9 that are low profile that are reliable and OC proof?
There is no real need to chase 1866 ram. The benefit you get in real app performance or fps is minor with newer intel cpu's.
Read this article: http://www.anandtech.com/show/4503/sandy-bridge-memory-scaling-choosing-the-best-ddr3
Benchmarks look good, but real app performance or FPS difference is perhaps 1%; not noticeable.
Also, unless you are heavily overclocking your ram, 1.5v ram does not need any heat spreaders at all. Fancy spreaders are mostly for marketing. I would just buy a low profile kit.
If you really want the vengeance ram, I think the heat spreaders can be removed, and/or the ram can be installed in the more distant two slots.