Summary: Usually sits on top of first stick of ram if you use thicker fans. The 48 watt deltas worked and fit just the same, though 250CFM seemed to not make a difference compared to the stock fans after 80 degrees. Would easily cool below 65 degrees @4.8GHZ (no voltage increase) to the 2600k 4.4 on the haswell yields about 84 degrees Ended up just using it on my 2nd machine and goin watercooled for the Haswell 4770k. It really does need it if you're overclocking.
Summary: This is very big. Like, I'm not able to close the side panel of my PC with this installed because I have a fan on the panel as well. That aside, I love it. This is really powerful and you can feel how cool it is without the fan by touching the metal. Very high quality. Just be warned about the size if you have a smaller tower and you want to close it completely.
Summary: Works well. No overheating on an overclocked CPU. Like the pots to adjust fan speed. Fairly quiet, if you keep the fans as low as they need to be. It's a big unit, so make sure you have the space but the installation instructions were easy, and they provided a bunch of adapters to fit a variety of processors. I use it on an i7-920 and temperatures stay reasonably low, even when approaching 4 GHz.
Summary: The cooler came without the rubber attachments to connect the secondary fan to the cooler; thus rendering this cooler substantially more ineffective. Efforts to get Thermaltake to send me the four tiny rubber bits was met with way more friction and bull**** that is necessary. Definitely will be steering clear of this brand for all future purchases.
Summary: The fan is really nice! Don't forget that it has an optional second fan for dual cooling. However, it is so big, it extends over my RAM slots. So unless I remove one of the fans, I won't be able to move up to 32 GB of ram.. :( Only 16 GB at max, with two 8 GB. Oh well, I don't mind the size because I shouldn't really need anything more than 16GB of ram anyways..