ursatz
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Is it possible to make a BIOS update that will allow all of the case fans to be "SMART" instead of adjusted to a static speed? That would be the bee's knees!
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stiltz85
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Re: Fan speeds
2015/03/28 22:33:25
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I agree, like maybe have them speed up and down with at least the socket temp? Not sure what other temp sensors are on the board but yeah, not a fan of same speed all of the time.
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GTXJackBauer
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Re: Fan speeds
2015/03/28 23:11:17
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Not to hijack your thread OP but I also wish the 2nd CPU PWM header was actually PWM, as advertised.
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stiltz85
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Re: Fan speeds
2015/03/29 00:30:24
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It isn't? I've got a 120mm in each CPU header for my 240 rad, as far as I can tell both run at the same speeds.
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GTXJackBauer
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Re: Fan speeds
2015/03/29 01:38:01
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stiltz85
It isn't? I've got a 120mm in each CPU header for my 240 rad, as far as I can tell both run at the same speeds.
But can you change the settings on CPU PWM Fan Header #2?
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stiltz85
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Re: Fan speeds
2015/03/29 07:52:14
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I believe they both share the same settings. They increase and decrease together.
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Andrey_T
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Re: Fan speeds
2015/03/29 09:02:42
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CPU Fan Header #1 and CPU Fan Header #2 are controlled through BIOS completely independently. I.e. no, in general case they do not share the same settings and do not run at the same speed. Of course, they probably use the same temp sensor as their input, so if you use identical fans and specify identical BIOS settings for both #1 and #2, it is normal to expect them to run at the same speed.
post edited by Andrey_T - 2015/03/29 09:23:31
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stiltz85
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Re: Fan speeds
2015/03/29 09:19:18
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I'm unable to verify at the moment, my PC is packed up as I am about to move.
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GTXJackBauer
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Re: Fan speeds
2015/03/29 16:27:14
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Andrey_T
CPU Fan Header #1 and CPU Fan Header #2 are controlled through BIOS completely independently. I.e. no, in general case they do not share the same settings and do not run at the same speed. Of course, they probably use the same temp sensor as their input, so if you use identical fans and specify identical BIOS settings for both #1 and #2, it is normal to expect them to run at the same speed.
That's what I figured but I can't get my #2 to do anything. I have #1 assigned to my PWM pumps which work fine via BIOS. But my fans, I should add I am using 2 PWM fan splitters isn't working at any changes. My fans constantly work @ 100%. This only happens if the fans aren't being fed a PWM signal. My guess is the PWM signal is too weak to be fed to two splitters with a total of 9 fans off of the #2 CPU PWM header or the #2 isn't PWM.
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stiltz85
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Re: Fan speeds
2015/03/29 19:04:50
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9 fans on one header? Yeah, I think you might just be dividing the voltage a little too much.
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GTXJackBauer
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Re: Fan speeds
2015/03/29 19:24:06
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stiltz85
9 fans on one header? Yeah, I think you might just be dividing the voltage a little too much.
Sorry, I should have been more specific. The Pumps and splitters are self powered straight from the PSU. No power other than the PWM signal is being supplied by either CPU PWM headers in my build.
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Andrey_T
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Re: Fan speeds
2015/03/30 06:53:14
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gtxjackbauer
The Pumps and splitters are self powered straight from the PSU. No power other than the PWM signal is being supplied by either CPU PWM headers in my build.
I don't remember seeing any hard evidence of that (like a signal oscilogram or a confirmation from EVGA itself), but it has been said that the CPU Fan header #2 is really non-PWM, despite EVGA's claims that it is. A simple experiment shows that header #2 is able to change speed of a 3-pin non-PWM fan, which means that it is capable to voltage-control the fan (as non-PWM headers do). This is not enough to conclusively call it non-PWM (considering what modern controllers can do), but it seems to indirectly suggest that. If so, this is the reason your fans run 100% all the time. There's simply no PWM signal at all.
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