Mursalin :
yea but my pc is very noisy and i heard that liquid coolers are very silent compared to air coolers
That is true but also a lie
Its is true if you have a custom water loop since you can go totaly overkill with radiators.
Take the AIO`s and the H55 you where talking about.
It will cool your cpu almost as good as any aircooler, but to keep the water to air ambient temps (called DeltaT temps) you need to run the fan(s) at high speed, and that as you should know creates noise.
The bigger the aircooler is the lower the fans can spin without the temps going to high.
Same goes for watercooling.
Take my rig as an example.
I buildt this purely to get the noise down as mutch as I could and aesthetics.
I could get away with only a 280mm - 360mm radiator, but then my water temps and computer hardware would be hot and at the same time the fans I would have put on the radiators would have run at very high RPM to dissipate heat.
So to get the noise down I had to go with bigger radiators + more fans (makes sence?).
Now I got two 480mm and one 280mm radiator with fans in push / pull setup so that brings the total fans just for the radiators to 20 fans! and I got 3 case fans, so that brings me to 23 fans total.
Now since I have this mutch radiator surface to dissipate heat with I can run the fans at very low RPM.
Just sitting here browsing the internet the fans dont spin at all. They only spin up during games and then even they never ever go over 490 - 520 RPM (inaudible)
My 3 case fans is set to a static RPM of 700RPM (inaudible)
So to sum it all up:
No single fan AIO is better than an aircooler, and will most likely be more noicy than an high end aircooler to be honest.
Want AIO? go for 240mm or 280mm radiator setup as a bare minimum.
And if you want a totaly silent system then there is no other way around it than to go totaly overkill on the cooling.
The smaller the cooler the higher the RPM on the fan(s) = more noise.
Bigger the cooler the lower the RPM on the fan(s) = less noise.