[SOLVED] Do you need a pump and reservoir to watercool a CPU?

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DovahTube

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Oct 14, 2015
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I am new to the liquid cooling realm and I have plans for liquid cooing my system in the future. I've seen many builds that have watercooled CPUs with just the radiator, fans, and water block. So my question is:
Do you need a pump and reservoir to liquid cool a CPU?
 
Solution
getochkn
There is always at least a pump. Something needs to move the water, no way around that. A reservoir is optional. Makes toping up easy and changing fluid easier than trying to bleed a system, but not needed.
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DonkeyOatie

DonkeyOatie

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Sep 16, 2014
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No pump, no water flows. Those systems probably have the pump built into the water bock.
No reservoir, not enough water and almost impossible to fill and keep or get the air our. Some reservoirs are quite small and built into the radiator.

All-In-One coolers have all of the parts, although they may not be obvious. Custom loops need them all. A reservoir does not need to be a big tank, just a small dead space.

What were you thinking of, in particular?
 
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synphul

synphul

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Mar 11, 2011
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You do if you're using a custom loop, one in which you purchase the various parts separately and connect them yourself. If you're referring to premade all in one solutions like the h80i/h100i, nepton or various other water coolers then no. They appear to have a radiator, fans and water block but they've got all the necessary parts built in. The water block often also houses the pump and a reservoir isn't absolutely necessary. The system is sealed at the factory with hoses and everything preassembled and the user then only has to screw the fan/radiator to the case at one of the fan openings and mount the water block/pump combo to the cpu with thermal paste like a standard air cooler.

Even if going with a custom loop, a reservoir isn't absolutely required. It can be beneficial, adding both to the looks (provides a large clear chamber to hold reserve water/coolant viewable through a windowed case), offers a means for air bubbles to rise out of the fluid and can be fitted with fill ports for adding coolant more easily to the system. It can also provide a visual for how much or little coolant is in the system so while adding coolant to the system the first time and bleeding the lines and radiator of air you can see how full the cooling system is.
 
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