does low flowrate wb = bad or good ?

[rickyman123]

i am wondering is high flow rate (GPM) waterblock better than low flow rate?

Apogee XT (1.38GPM)
HK 3.0 (LC-1.91 , LT-1.77 GPM)
EK Supreme HF (LT-1.52 GPM)

does this make sense:

low flowrate wb= bad
high flowrate wb= good?

 

[weuntouchable]

Its really not a matter of one being good or one being bad. Either extreme would be bad. Too low of flow and your water isn't going to run through the loop frequently enough to cool your components. Too high of flow and your water will run through the radiator too quickly and won't be cooled properly. The ability of your pump to move an amount of water is more important than the ability of the block. The Apogee XT and HK 3.0 are pretty equal in performance when paired with common components, so the difference in their ability to move the water is negligible when it comes to performance.

 

[sok0]

This should answer all your questions if you scroll down. And all the top performaning cpu blocks perform within a couple C of eachother regardless whether they are high flow or high pressure blocks.

 

[ghost6303]

Too high of flow and your water will run through the radiator too quickly and won't be cooled properly.

mmm, not really. one gallon of water circulating thru your loop will be cooled the same way no matter the flow rate. but as you get into rediculously high flow rates, the pumps get louder, and you get diminishing returns. too high of a flow rate isnt really bad- just more of less unnecessary, and harder to obtain.

also in fluid dynamics there is what is called dynamic head, where the higher the flow rate, the exponentially greater the back pressure is in the system.

like driving down the street with your arm out the window at 10mph isnt very difficult, but at 20mph its more then twice as difficult as at 10 mph. and at 50mph its wayyyy more then 5x as difficult as as 10mph.

 

[Shiny]

Although, one thing to account for is what kind of impingement system the block uses. In the case of those premium blocks, they tend to use an impingement system where more turbulence equals a greater cooling effect.
Those three specific blocks are all very good, as you probably know, and are the top three blocks for their class at the moment. It's unlikely to give you much of a difference either way unless you have an extremely large amount of restriction in addition to the block (such as having a very restrictive radiators and several other blocks), or have a very weak pump.
A standard dcc 3.2 should be able to do the block, a gpu block, and a decent sized radiator.