Dakle,malo sam kontao koji ladnjak uzet za moj cooler,i googlajući došao sam do svega par tekstova koji objašnjavaju da za ventove za proc,koji se susreću s gustim meshom metala(čitaj: otpora) ne vrijedi pravilo
više rpm-a i cfm-a = bolje. Kod njih se gleda jedna mjera koji proizvođači često uskračuju javnosti: statički pritisak/static pressure ili na dojče: Luftdruck(jedinica je mm-H2O).
Ukratko,većina fanova s niskim statičkim pritiskom(a visokim ostalim vrijednostima) se koriste kao case fanovi,zbog toga jer se susreću s malim otporom kod upuha i ispuha....dok za CPU coolere pogoduje manja skupina ventova s visokim statičkim pritiskom.
Evo i jednog zgodnog teksta s T-Hardwera:
Citiraj:
Every fan has a performance curve which describes it's flow and pressure characteristics. The higher the pressure across the fan, the lower the flow through the fan and vice-versa. The pressure across the fan, and hence the flow through the fan, is dictated by the system in which the fan is installed. Things that impede airflow, such as small holes, heatsinks, filters, wires, convoluted flow paths, etc. cause an increase in the pressure required to drive a particular flow. The effect of this is that the more resistance you put in the path of the fan, the more the flow through the fan will drop.
As for the the static pressure quoted by manufactuers- I assume this is either the max pressure the fan can deliver (ie. when flow = 0), or the pressure at the fan's design point (ie. flow = x cfm at y mm H20- or whatever other units of flow and pressure you want to use).
Of course, manufacturers don't seem to make performance curves available to the public, and trying to work out the airflow resistance of your case or heatsink is nigh on impossible, not to mention a waste of time. What you need to know is that systems in which there is a high resistance to flow (heatsinks being a common example) will require a higher static pressure rating than systems which have a low resistance to flow (typically cases). So if you have a high resistance system, like a CPU heatsink, installing a powerful fan with a high pressure rating will ensure you get a decent airflow flow over the heatsink.
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Gledajući po netu nigdje nisam našao tu vrijednost za Alpenfohn hladnjake.... a od potencijanih zamjena kao najjače bih izdvojio ova dva:
Noiseblocker BlackSilent Fan XLP - 120mm PWM
Akasa Apache 120mm PWM-Fan - camou
Zanimljivo je da su ti,ventovi s najaćim statičkim pritiskom često i PWM hladnjaci,osim naravno nekih verzija Scythea,Papsta i sl koje se koriste za OC bencheve.....
Znam da nisam otkril toplu vodu ali o ovome na PCE forumu dosad nije bilo riječi,bar ne dosada(tako search kaže)
Ako itko ima šta pametno za dodat....slobodno nam proširite horizonte....