Summary: I've been building my own custom computers for over 15 yrs. I've always used a 100% air cooled system up until now. With recent high end cpu clock speeds in the 4ghz range air coolers have gotten ridiculously large and hard to work around. I really didn't want go 100% liquid cooling because of the expense and trouble so for my recent build I decided to go liquid on the cpu only.
Summary: Ok, I'll admit I made a mistake! I bought this without any fans and ended up using my case fans to push air through it. Surprisingly, the temp of my cpu drop 50 degrees. It rarely goes about 119. Mother board is now staying around 109. Later I purchased a couple of Corsaid fans to use with it, and it still runs great, and a lot quieter than I expected. If you've never replaced a cpu fan of the newer types, make sure you READ all the instructions.
Summary: I bought the H70 (with no fans, I used my own) off of Newegg with a $20 rebate, and it was a very good purchase in my opinion, although I didn't really see a good improvement until After I added a second fan. My case is very small for a gaming case, and I can only fit one fan on the cooler before it gets in the way of my RAM.
Summary: Grabbed this in addition to a bracket from triptcc's website and was able to mod my GTX 580 in one afternoon. My temps were previously hitting 99+ degrees C under 100% load and this dropped the temps down to 60C max, with idles in the 30s. Much much improved. Beware the tubes coming from the radiator aren't as long as they seem. I was only able to mount this+fan to the back of one of the hard drive bays in my 650D case.
H-70: Take your time with install, but works like a charm-
Paul W. Norman "Magic Paul", Amazon
23 June 2012
Summary: I bought my H-70 for a new build for my X-58, EVGA 560Ti, Intel:950CPU, 16GB Corsair memory, primarily for gaming and MS Flight Simulator X, etc. Also, I do a lot of video editing on Sony Vegas software, etc. At first, I must admit the H-70 was a bit of a hassle to install. But that was my fault; I rushed. But once I looked at the instructions even more closely and saw how to adjust the plastic screw mounts and bracket correctly everything went fine.
Summary: ~$100 for the H100, $80-$90 for the H80/70 the value of these units really cannot be touched. There are currently two readily available air coolers that can compete with these units. The Silver Arrow and the Noctua NH-D14. These air coolers are massive and restrict was types of memory you can use or how many DIMM slots you can populate. For a few dollars more you can get a H100/H80/H70. I wouldn't waste my time with a H60/H40/H50.