I don't understand AIO liquid coolers

[TraceL]

I have an Intel i5-2500k and i am planning on overclocking it. However with my current cpu fan cooler, which is the Thermolab BADA 2010, i cant overclock it that much.

Now from what i've heard, an AIO liquid cooler will help me by a lot, and i would like to buy one. The problem is, when i look up AIO liquid coolers, all of them "Looks like" they only have a radiator and a heat block.

The question is, do i need to buy anything else? (Like the water, or some sort of other hardware)

P.S. Another question, will a Coolermaster Seidon 240P be good for overlocking the Intel i5-2500k to around its limit, or is there better alternatives thata arouns that price range (70$ - 120$)

 

[Gam3r01]

Well AIO is one term, but a better term is CLC (or closed loop cooler). Everything you need is already inside the closed loop. They are a waterblock (with a pump inside) and a radiator+tubing sealed with liquid already inside.

My recommendation however, is to not invest that much money into such an old processor.
Either put the money towards a new unit (which would be the best use of the money), or get an H7.

 

[k1114]

People think water is better and quieter when it's not for most of the aios. The air coolers that perform the same or better will be cheaper. The 2500k doesn't need much anyways. I ran mine on the good old 212+ for $30 back then. I got to 4.6ghz keeping temps in the 50-60s under use.

 

[n0ns3ns3]

CLC AiO is not going to help with overclocking.
Good air coolers in 50-90$ range will do the same or better job at lower noise. not to mention that air cooler are much more reliable.