is why I'm avoiding water based cooling solutions:
At first appearance, I was extremely excited about purchasing a Corsair H-70 Liquid CPU cooler. I totally liked the idea of how a massive CPU air cooler would no longer restrict the overall air flow in my new CM HAF 932. Also, just the thought of much less weight on my motherboard was very attractive to me. Finally, when I read the benchmarks on the Corsair H-70, and how it did a fairly good job of cooling, I was sold on it.
After reading many, many glowing reviews and absolutely stellar reports about Corsair's Liquid cooled H-70, I eagerly purchased one and installed it in my computer.
It worked well for about 30 days. Suddenly, one day when I can home I smelled the very strong odor of something similar to anti-freeze. My computer would not boot, and at first, I could not figure out what was wrong. Then I opened my computer case...
What I discovered was shocking. The Corsair H70 had sprung a leak at the point where the hose attaches to the water pump. I still could not figure out how and why I kept smelling a strong automobile anti-freeze like odor...and then I realized the smell was from the liquid the Corsair H-70 was dumping on my motherboard. After doing a little more research, I discovered that Corsair does not use water but Propylene glycol, also called 1,2-propanediol or propane-1,2-diol, is an organic compound (a diol or double alcohol) with formula C3H8O2 or HO-CH2-CHOH-CH3 as the liquid inside their H-70 liquid CPU cooler. I am thankful that the leak only killed my motherboard. Propylene glycol is toxic to small animals. Veterinary data indicate that propylene glycol is toxic to dogs with a 50% chance of being lethal at doses of 9mL/kg, although the figure is higher for most laboratory animals (LD50 at levels of 20mL/kg).
I emailed and called Corsair, explaining the problem and requested a full refund for my purchase of a defective item that killed my very, very expensive motherboard. They outright refused. Instead, they insisted I package up the leaking H-70 and mail it to their factory so they could "confirm" that what I said actually occurred. I spent another $15 to mail the defective H70 to Corsair.
Finally, after 4 weeks, Corsair sent me an email, confirming the H-70 was indeed defective. They insisted on mailing me a replacement...something I did not care for.
After this experience, I ripped out every Corsair Liquid CPU Cooler I have ever installed [over the last 2 years, I've installed other Corsair liquid CPU Coolers in other systems]. I replaced these liquid coolers with simple yet effective CPU air coolers. The stress of wondering if my next system build would develop a leak was just too much. There is enough stress in the world and I did not want to needlessly add to the stress already out there by installing a component that would place the entire system at risk.
I realize many people are happy with Corsair's liquid CPU coolers. I am happy it is working out for them. For me personally, I will never trust a high end system to Corsair for a liquid cooled solution. I will continue to purchase their PSU's and RAM, but I will never touch their liquid CPU coolers ever again. Way too much risk, way too much stress and way too much irreparable damage with an accompanying deep disappointment.
So I bought this Cooler for the new LGA2011 3960x build I put together back in December. I was really excited. For 2 months the system was phenomenal. Then today, after 20+ hours of gaming, my computer shut off. I restarted it, and it bluescreened with all kinds of gibberish. I took the case door off to find that the pump had come apart and the fluid was leaking from the hose/pump connection.
I setup one of these units in a friends computer we were building. Things seemed to be working great. Then he brought it back to me. It was making an odd noise. He thought it was the fan but when I listened to it, it sounded like the pump causing the noise. He decided he would return it and we would just put an air cooler on.
I detached it from the back of the case and as I was moving it down it must have pulled a little and POOOFFTTTT, instantly, faster than I could blink, I was covered in antifreeze. An ultra fine mist now covered me, my friend, and most of my dining room and kitchen. The rest of the liquid was pouring out of the end of one of the hoses.
Apparently it had built up pressure on one side of the pump and not the other. Moving it around was just enough to pop the connector between the hose and the radiator off on that side and it just exploded all over us.
So, be very careful with all 4 ends of the hoses on these, especially if you're moving it around.
We dried everything up and let it sit to dry for a while, luckily everything was off. So just be very careful if you move anything around in your case while it's on (moving wiring harnesses, etc.). Because one wrong bump and your whole system could be covered in liquid.
There is a defective batch of the H80 going around. After installing, the water pump makes a very loud buzzing / grinding noise so loud, it can be heard 20 feet away. The fan control (which is on top of the cpu) is also defective. There are 3 settings and each setting, the fan spins at the same speed. No changes at all even at the max setting.
This unit leaks. I was dusting my PC when I noticed some fluid stains on the fans. To my surprise, the fluid was coming from the so called "sealed" radiator. I noticed that the fans had gotten louder and I had been having some heat issues, so I thought it was due to built dust in my PC, it is a good thing I decided to check it when I did; the radiator is right above my GTX570's. Save your money.
These are all horror stories from the 1-star rankings of Corsair Hydro Series Liquid CPU Coolers on Amazon. There are many more similar stories...I personally just won't risk it on such an expensive rig for what would amount to at most a few degrees difference in temperature.