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Quick Sabretooth z87 fan question...

post #1 of 8
Thread Starter 
Hey everyone I'm just wondering will i be able to reduce/set 3pin fans speeds with this mobo or will i need to go for PWM fans? thanks - Adam
post #2 of 8
Quote:
Originally Posted by Adam182 View Post

Hey everyone I'm just wondering will i be able to reduce/set 3pin fans speeds with this mobo or will i need to go for PWM fans? thanks - Adam

I got the older Sabertooth Z77 and I can control 3-pin fans no problem. But you can only do that on the headers marked CHS_1, 2, 3, and 4. From what I understand, these headers will under volt to control fan speed (whether it's a 3-pin or 4-pin, it doesn't matter). The CPU and CPU_OPT connectors will not under volt, fan speed control comes from the PWM signal only. To set the fans, you can adjust it in the BIOS manually if you want, or there's the Fan Expert 2 software if you prefer to do things that way. I did a quick search and it looks like this is the same case with the new Sabertooth Z87. I hope this helps! smile.gif
post #3 of 8
Thread Starter 
Thanks for the reply francisw19 that totally helps. So i guess i could get 4 non PWM fans and 2 PWM fans and have control over them all. Is it possible to get some kind of connector to connect 2 fans to one header and just have them both undervolted the same? that way i could just do away with the PWM fans entirely. Also do the fans that are part of the thermal armor have their own headers or will they be taking up two of the headers you mentioned? Thanks again! much appreciated - Adam
post #4 of 8
Quote:
Originally Posted by Adam182 View Post

Thanks for the reply francisw19 that totally helps. So i guess i could get 4 non PWM fans and 2 PWM fans and have control over them all. Is it possible to get some kind of connector to connect 2 fans to one header and just have them both undervolted the same? that way i could just do away with the PWM fans entirely. Also do the fans that are part of the thermal armor have their own headers or will they be taking up two of the headers you mentioned? Thanks again! much appreciated - Adam

Glad to help! You can get splitters for TX3 connections like this one. Generally, they work pretty good, the only thing you'll have to be careful about is how much current the fans draw. Normally, the fan headers are good for 1A of current (but double-check to be sure with your board!). So check the current on the fans you want to pair up and be sure you're well under 1A to be safe. That said, most standard fans out there are under, say 0.25A, so there's a good chance you'll be OK.

Another direction you can go is using a PWM splitter like this. The advantage of this is you can control 8 PWM fans altogether from one PWM header and the power is plugged into your PSU instead of pulling from the motherboard. Just food for thought...it's up to you how you want to do it. smile.gif
post #5 of 8
Thread Starter 
Thanks again for the great info!, ill be using the NB eloop fans and they pull around .17A so i guess i would be ok with those. This version states the speed as being 400 - 1500rpm, do you know if thats definitive and that there no way to have them running at say 200rpm and then ramp up from there when required. Im not even sure what an Idle fan speed should be really, i know it would depend on any amount of factors but i i wouldnt have to worry if i didnt need them to go below 400 anyway - Adam
post #6 of 8
Quote:
Originally Posted by Adam182 View Post

Thanks again for the great info!, ill be using the NB eloop fans and they pull around .17A so i guess i would be ok with those. This version states the speed as being 400 - 1500rpm, do you know if thats definitive and that there no way to have them running at say 200rpm and then ramp up from there when required. Im not even sure what an Idle fan speed should be really, i know it would depend on any amount of factors but i i wouldnt have to worry if i didnt need them to go below 400 anyway - Adam

Yup you'll be OK with the NB eLoop fans. thumb.gif

The ones you linked are PWM, so it's only guaranteed to not rev below 400 RPM if you are using a PWM connector. Basically, the way the fan works is when the PWM signal is set to 0%, then fan rotates at 400 RPM, and as you likely guessed with the PWM signal at 100%, they will run at 1500 RPM. Now, with undervolting, there is a "Fan Speed Low Limit" setting in the BIOS. Presumably, this is what will prevent the fan from running too low? On that subject, however, I just remembered that the lowest I can set the CHS_1/2/3/4 fans in the BIOS is 60% (i.e. approximately 7V). However, the CPU connector can set the PWM signal all the way down to 0%. I'm not sure if this is the same on the Sabertooth Z87, but it would be worth checking in to if you are going for complete silence.
post #7 of 8
Thread Starter 
Thanks again for the awesome help! Ive been looking in the user manual and took some screen shots.. Warning: Spoiler! (Click to show)
Warning: Spoiler! (Click to show)
Warning: Spoiler! (Click to show)
Warning: Spoiler! (Click to show)

From what i gather it looks like i can control standard fans from all the CHA_FANS and the CPU_FAN/OPT within a limit of 20% - 100%.

What i dont understand is why it doesn't mention PWM fan control for the CHA_FANS.

If im right in that standard fans can be controlled by all the headers it seems i wouldnt really gain any extra control if i went for the more expensive PWM fans.

On the other hand i might not have a clue what im talking about here and be totally wrong!

Thanks again really appreciate it! - Adam
post #8 of 8
Quote:
Originally Posted by Adam182 View Post

Thanks again for the awesome help! Ive been looking in the user manual and took some screen shots.. Warning: Spoiler! (Click to show)
Warning: Spoiler! (Click to show)
Warning: Spoiler! (Click to show)
Warning: Spoiler! (Click to show)

From what i gather it looks like i can control standard fans from all the CHA_FANS and the CPU_FAN/OPT within a limit of 20% - 100%.

What i dont understand is why it doesn't mention PWM fan control for the CHA_FANS.

If im right in that standard fans can be controlled by all the headers it seems i wouldnt really gain any extra control if i went for the more expensive PWM fans.

On the other hand i might not have a clue what im talking about here and be totally wrong!

Thanks again really appreciate it! - Adam


So it looks like the CPU and CPU_OPT fans work with both voltage control (3-pin) and PWM (4-pin) fans. This gives you some nice flexibility since you can either go with PWM or non-PWM fans on your CPU. thumb.gif

With the chassis fans, it looks like they are still just voltage control only like my Sabertooth Z77 board. Just to clarify, the actual headers on the board are 4-pin and look like PWM headers, but they do not send the PWM signal...it's just voltage control on these only. See, PWM fans still work without the PWM signal (the fourth pin). In such a case, they just go full speed. With that, a PWM fan will still work on the chassis headers, but again, the speed reduction will only come from voltage reduction and not the PWM signal. So when you are researching fans for these headers, just make sure you find ones that can under-volt without issues and you'll be OK. smile.gif

I'm always glad to help, keep the questions coming if you got any more! smile.gif
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