Originally Posted by blitz6804
BlackOmega: Higher CFMs do not always equate to higher cooling potential, as Frostytech
proved with the Sycthe Orochi and a Mil-spec impeller. For a 12Âº C improvement over the stock fan (14.5Âº versus 26.2Âº C) they increased the noise output from 27.8 dBA to 87.4 dBA.
If you wish to read about the actual Sycthe Orochi
, feel free to do so. It is an interesting cooler in my opinion.
Thats not really a comparison. The heatsink itself is huge so the actual surface area that gets heat transferred away is also huge. So therefore a lot of air movement is not required.
I think a better comparison for airflow vs. cooling performance is a stock CPU cooler. Kind of like what I did. Stock AMD cooler with a Tornado fan. While I dont know the CFM output of the stock fan, Im going to assume since its a stock unit is intended for home PC's itll be quiet and therefore not move a lot of air. So lets say it moves even 50cfm out a 80mm fan. the Tornado moves 90cfm @ 5700 rpm. Mine runs @ 6136. So on the conservative side lets say it moves 95cfm.
Stock fan and cooler temps were cpu 35*c @ idle and motherboard 33/c (with no overclock). With the Tornado both idle between 28-30*c dependent on ambient (400mhz OC). And in a 24*c room idle is 29*c. Now under load, the stock fan and heatsink cant support any sort of overclock @ 100% load for very long before the temps go through the roof (65*c). Literally about a minute, if that.
Now with the tornado fan 100% load @ 400mhz OC it barely reaches 59*c running the FPU test in SnM and can sustain a stress test for an hour and a half. So in this instance as you see, CFM plays a huge role in cooling. Only downside is the fan runs @ 55dB.
But since my rig sits in my living room and its shared with my wife and childern, that is unacceptable.Edited by BlackOmega - 11/24/08 at 6:24pm