Quick question on fan rpm
- Thread starter Bounti
- Start date
Typically the larger the fan the lower the rpm. But in all likelyhood whatever fans you use are voltage controlled and are set as a percentage of max, so if the fans are different, then they will have different speeds.
To answer your second question it would be fine. Not off the same header though if the header is providing the power.
To answer your second question it would be fine. Not off the same header though if the header is providing the power.
coastie65
Splendid
- May 26, 2010
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You need to check the CFM rating on the various fans. It would stand to reason that a 140mm fan would move more air than a 120mm at the same RPM, but that isn't always the case. If you have the 140mm fans as exhaust and the three 120mm fans as intake, you will create a positive air flow. I have a 200mm in front at the bottom for intake, a 120mm at the rear for exhaust and two 120mm at the top for exhaust. Anyway, the object is to have a good flow of air moving through the case, while at the same time, keeping it as quiet as possible.
Oh I see.. I will be controlling 3 front intake fans and 1 back exhaust fan with a 4-way pwm splitter that gets it power from the psu and will be connected to one of the motherboard headers. They will all be controlled through software in the same profile I presume? Is this viable even though 3 are 120mm intake fans and 1 is a 140mm exhaust fan?
Thank you guys
Thank you guys
That will work fine.
Since you are splitting the signal, they will share. So let's say you connect it to a case fan header labeled sysfan1 or whatever. Only one of the fans will report it's signal to the motherboard, so you actually won't know what different fans are running at. In the bios you will have a setting that controls sysfan1 (or whatever it is called) and whatever you set that to as a percentage, it will modify the voltage going to each of the fans. You will see it show up as only one fan though since only one fan is reporting it's speed. Anyway, the fans themselves will probably not be running at the same speed since they are different fans but it will do what you want.
Since you are splitting the signal, they will share. So let's say you connect it to a case fan header labeled sysfan1 or whatever. Only one of the fans will report it's signal to the motherboard, so you actually won't know what different fans are running at. In the bios you will have a setting that controls sysfan1 (or whatever it is called) and whatever you set that to as a percentage, it will modify the voltage going to each of the fans. You will see it show up as only one fan though since only one fan is reporting it's speed. Anyway, the fans themselves will probably not be running at the same speed since they are different fans but it will do what you want.
That explains a lot, thank you. If I have 4 other intake fans to control, would it be the same if I group them with the 3 intake fans we talked about and connect them to an 8-way pwm splitter? Or will it put pressure on the motherboard even though it is getting power from a sata connection with the psu? Also, would you recommend connecting the 140mm to a different motherboard header, separate from the 120mm fans? Then have them run in a profile with the same rpm as the other case fans to not be relying on the speed of the other fans.
Thanks again deuce.
Thanks again deuce.
It won't put any stress on the MB header because the power is coming from the PSU directly. So an 8 way would be fine.
Basically you can do it one of several ways. The first way, is to use the actual pwm header on your MB (the cpu fan header). It is most likely the only true pwm header on the board. So you connect all your fans to that one header, and make the cpu fan the one that reports back to the MB (I assume you are talking about the swiftech splitter; it is color coded). This will allow everything to be run off of pwm. The different fans will run at different speeds but they will be the "correct" speeds for the temps you set.
The other way to do it is as you said, connect the different fan types to different headers using splitters as needed. You can then set up different profiles in the bios for each header. Only problem with that is because they aren't really pwm headers, you won't have as fine of control over the speed, with probably a minimum of 60 or so. Entirely up to you, either will work fine.
Basically you can do it one of several ways. The first way, is to use the actual pwm header on your MB (the cpu fan header). It is most likely the only true pwm header on the board. So you connect all your fans to that one header, and make the cpu fan the one that reports back to the MB (I assume you are talking about the swiftech splitter; it is color coded). This will allow everything to be run off of pwm. The different fans will run at different speeds but they will be the "correct" speeds for the temps you set.
The other way to do it is as you said, connect the different fan types to different headers using splitters as needed. You can then set up different profiles in the bios for each header. Only problem with that is because they aren't really pwm headers, you won't have as fine of control over the speed, with probably a minimum of 60 or so. Entirely up to you, either will work fine.
All right mate, I'll be hooking up the 7 intake fans and the exhaust fan with a pwm splitter to control them through a case fan profile and then 4 rad fans with a 4-way splitter to control them with a radiator fan profile. I just hope that the 140mm fan won't be "out of sync" or louder than the rest of the fans (or vice versa). Thanks for the help!
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