Originally Posted by Infinite Jest
Quick fan question(s):
First are the decreased life expectancy and potential rpm of these fans
acceptable versus this one
. It's hard to beat 4 fans for the price of 1 1/3. I'm going to be using this as a bottom intake mount and may have it hooked up to a control. Also, does pwm matter at all outside the realm of mobo headers (i.e. using with a control)?
Also, would this
be sufficient as a side intake fan mounted on the mesh?
EDIT: Damnit! Sorry for the double post.
EDIT2: Is it normal for the idle cpu temp to drop after a few days? Mine started out around 40C for the first day and as of last night in this morning it's been settling in the mid to low 30C range and still dropping. Is my cpu imploding or is this normal?
The fans in the 4 pack are the cheapo 120 fans that CM ships in a lot of their cases. They are cheap, quiet, but have no static pressure to speak (so are useless on heatsinks) and move very little air (they don't come close to the 4cfm in their specs). I wouldn't pay more than a buck a piece for them, and that would include shipping. If you don't care about LED lights and just want some good solid black fans that will move some air, have decent static pressure, won't break the bank, and aren't too loud get some Yate Loon D12SM-12's (Medium Speeds) for case fans. They also work fairly well as cpu heatsink fans, but they work best in a push/pull setup. Used like that they provide about the same temps (normally within 1-2C) of the higher speed and noisier High Speed D12SH-12 Yate used by itself, but considerably quieter. The High Speeds have more static pressure and move more air, but they are noticeably louder. If you want super quiet ones get their D12SL-12 Low Speeds. They are fine as case fans, but don't do very well on heatsinks.
If the opening can accomodate a 140mm fan, then go with either the Yate Loon D12SL-14 Low Speed or D12SM-14 Medium Speed fans. They are even quieter than their 120mm equivalents, but move the same amount of air. Their output is less focused than the 120mm fans so their static pressure is lower and they don't work quite as well on heatsinks, but as case fans they do fine.
Yate's are nice in that they can be picked up fairly inexpensively (sometimes for as little as $4 each for the 120s). With a bit of care they will last a long time. By that I mean lubricating them just prior to installing them and then once or twice a year (once if they are mounted blowing side to side and twice if they are mounted blowing up and down due to their sleeve bearing), but any sleeve bearing fan needs the same care to last.
Finally, you don't need hundreds of cfm's of air moving through a case to get good cooling so fans like those San Aces and Deltas are overkill. They are good for heatinks and rads for extreme cooling, but for case cooling direction and patterns of air are more important than massive amounts of airflow. Too much airflow through a case can be worse than not enough. I know in my CM Storm Sniper (which as far as I can tell is essentially the same chassis as the HAF 922 with different side panels and front and top bezels) I get the same cooling with just the standard 200 top and front fan and a Medium Speed Yate in the rear than I do with the 200 in the side panel. I can turn the fan speed of the two 200 fans down to their minimum and the temps are within 1C of what they are turned up to full speed (the rear exhaust MS Yate runs full speed all of the time). I'm still doing some testing, but more fans and more airflow doesn't seem to decrease temps in it. And I'm talking under 100% load too, not at idle. I get the same results on my Beta EVO case. More fans only made the case louder, not cooler. In fact, more airflow causes more problems than it fixes for me in that it is making it difficult to not over cool my hard drives (which is just as hard on them as over heating them). I'm fighting to keep the temps at 28C which is below the 30C minimum that hard drives should maintain for maximum life (hard drives should remain between 30 and 45C).