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Question: the power cord of this cooler has 3 pin and my asus sabertooth z87 has a 4 pin header can I still connect it to the 4 pin and it will work?
Document: Two cables come out of the Pump, one I connected to a Sata power connection, and the second you can connect to any 3 pin header, in my case I used the PSU header that wasn't being used. Now the pump has power and the RPM of the pump can be monitored.
The AMD clamp had to have two bits attached to it, and then it was a simply matter of placing the CPU cooler on the CPU, hooking into the AMD mounting hardware, and tightening it down (Be careful! Don't go too tight!) until it was firm and secure.The final step was to connect the 4-pin power connector and 3-pin power connector to their respective places on the motherboard.
If you take your time and don't have anything in the way you should be able to get it installed safely.Something to be aware of is that the pump and fan each require a fan header. The fan will use a 4-pin PWM based CPU fan header and the pump will use a 3-pin power or chassis fan header.In use I would consider the unit to be fairly quiet. I didn't hear any funny sounds.
At first I bought a new CLC from here AMAZON.COM by December 2013 , but after one time of using in my system ( CPU  AMD FX 8320 , MOBO Asus Sabertooth R 2.0 990FX ), testing in stock CPU frequency (3.5 to 4.0 GHz), given CPU Core 54C and CPU Socket 63C in full load with Prime95 for 20 min just, and the pump begin to sound clicking and stay extremely hot. I think the amazon sell me a refurbished cooler...?
Before connecting the splitter cables I used electrical tape on each connector to ensure stability. Only one of the five connectors is PWM 4-pin wired to get the RPM from 1 of the 4 fans, at the other end is two connectors and one of them I plugged into the CPU fan header on the motherboard. The second connector is a Molex and I plugged that into my 12V power supply. So the RPM is monitored by the CPU header and power for the fans is provided by the Molex.
One less thing you need to position. Although the thick tubes didn't like bending all that much. Otherwise the 4 thumb screws get everything all nice and snug and there was no movement at all. Connect the 3-pin and 4-pin cables to the appropriate connectors on your Motherboard, and you're done. Let's see how it works!ISSUES?But wait, on the first try, I had a problem.
I bought this because my stock CPU fan was dying on me, with temps reaching up to 65c. I was so glad that this updated version (up from the H80) was quieter (MUCH quieter than my other fan), and had far better reviews than the H80 and had more cooling power than the H60. The instructions were  alright... had to get a bit creative twisting the cooler tubes to fit my motherboard configuration (Asus Sabertooth 990FX).All in all this thing works amazingly!
In my case, I used a secondary CPU Fan header on the MB. This runs the pump and is very important that it's working. Your system should report an RPM of about 4500 RPM. Then the 4-pin connector for the fan itself, went to the CPU Fan header. This way I can verify that both are working correctly and the MB can control it's speed.PRO's:* CPU runs cooler!
Extremely simple.Lastly, you can connect the pump to a USB header on your motherboard using an included cable to control and monitor its speed and the LED lighting. You can also connect the fans to the pump; I opted to connect the fans directly to my motherboard's CPU fan headers so that their speed can be auto-adjusted based on the CPU temperature. The pump itself needs to run at a fixed RPM and it connects to an SATA power connector.
Ok, well I think I can cover more than just wow, but this cooling unit (H80i) from Corsair is a beast. I went from 3.5Ghz to 4.6Ghz with eaze and I'm still getting great cool temps straight to the CPU. I'm running a new Haswell i7 4770K and they run hot... Just the way they are, but they pack a punch in processing power.
Answer: Yup, three pin will go on 4 pin no problem just make sure you line it up right.