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Scythe Ultra Kaze into mobo - power issue?

post #1 of 14
Thread Starter 
Howdy! I want to put a Scythe Ultra Kaze (~130 CFM) into my rig as an exhaust fan. I'd like to use a 3-pin connector to plug it into my mobo so I can regulate fan speed (it can move 130 CFM, but it doesn't do it quietly). Does anyone know if there are any issues with plugging high-CFM fans into motherboards? I figure it may be undervolted, but that should just make the fan run slower (right?), which shouldn't be a problem ("slower" being a relative term when you've using these fans), and shouldn't hurt the fan. But I saw some posts somewhere that mentioned high-CFM fans burning out mobo fan sockets, and this worried my inner noob. Can high-CFM fans harm mobos with their power demands and glavin? Should I just molex it and get used to the whoosh? I'd like to avoid getting a fan controller, but if someone has a "cheap and effective" recommendation, feel free.

I guess I should mention that I also plan on putting a Scythe Slipstream (~110 CFM) in the front of my rig, as an intake, and I'd like to hook that one into the mobo too (but not as much). Summer is here. TIA.
post #2 of 14
I believe the maximum suggested fan amperage for motherboard 3 pin connectors is .35A... don't quote me on that though

I've personally had .65A fans hooked up to my motherboard 3 pins with no real issues... I believe the worst it can do is burn out the RPM sensor of the 3 pin which really doesn't matter (all of my .65A 120x38s were red/black leads only... no yellow RPM sensor)
post #3 of 14
I had my Ultra Kaze 2000 into the CPU FAN header on the 680i LT and it was fine. Now the 3000 does pull more juice at full but should still be fine. Read this thread in the eVGA forum and decide for yourself (or post to get more info there):

http://evga.com/forums/tm.asp?m=55462&mpage=1&key=�

Just make sure you feel comfortable with what you intend to do before you do it...it's no fun having to RMA a new board.

As for going Molex, that would suck to run the 3000 at full blow the whole time as it is a bit loud (and overkill unless you are OC crazy). Really, you should just get a fan controller and not worry about your mobo!

Edit: Here are some additional specs on the Ultra Kazes for you:

Model Number Fan Speed Noise Airflow Rated Voltage Rated Current
DFS123812L-1000 1,000 rpm 19.81dBA 44.44CFM DC12V 0.25 A
DFS123812L-2000 2,000 rpm 32.91dBA 87.63CFM DC12V 0.25 A
DFS123812H-3000 3,000 rpm 45.90dBA 133.60CFM DC12V 0.60 A


Good luck and let us know how it goes!
PacMan4
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CPUMotherboardGraphicsRAM
e6420 @ 3.0Ghz eVGA 680i LT eVGA 8800 GTS 640mb @648/1015 4GB OCZ Platinum 800MHz 
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320 Western Digital DVD±R/RW/CD-R/RW Windows Vista Home Premium 620W Corsair HX 
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PacMan4
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320 Western Digital DVD±R/RW/CD-R/RW Windows Vista Home Premium 620W Corsair HX 
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CoolerMaster 730 
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post #4 of 14
Thread Starter 
+1+1 Thanks guys...saw some posts somewhere that talked about this being a power-hungry fan that can hurt your mb (or at least fan header) if you don't molex it. If the evga guy says it's ok, I'll take his word for it. If I can't sleep at night because I can't stop thinking about it, I'll break down and get a fan controller. I'm looking forward to being horrified at how loud these things are.
post #5 of 14
i have 2 kaze 87cfm pluged into my mobo
Coeus
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post #6 of 14
Thread Starter 
+1 Do you see how many posts you have?!?
post #7 of 14
i have a few lol
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post #8 of 14
Quote:
Originally Posted by whe3ls View Post
i have 2 kaze 87cfm pluged into my mobo
These things are sweet. Noisewise for me, going from a x25mm to a x38mm fan was like dumping off the old VW and hoping into a new Mustang V8. They have a deeper sound that is cool and not too intrusive.

Cheers.

Oh, and lol again for the kid stuck in the chair avatar!
PacMan4
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PacMan4
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post #9 of 14
i have been thinking of getting a couple more these and the slip streams are my favorite fans
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Thermaltake 1350 
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Coeus
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post #10 of 14
Thread Starter 
Update:

1 ~130 CFM Scythe Ultra Kaze @10$, exhaust
1 ~110 Scythe Slipstream @9$, intake

ambient temp ~24 C

@100%, these things dropped CPU temps 6 C...and MCP temp 10 C (I'm sure SPP is noticing a chill in the air as well)! Not sure which pleases me more! Fairly loud @100%, compared to "default" (Antec Tricool/intake and stock case fan/exhaust), but lowering both to ~50% reduces much noise and only raises temps 1 C (keeping them @100% for now, just because). Very pleased. @~10$ each, these things could wear out every 4 months and it'd still be worth it. Thanks for all advice!

edit: ok, every 6 months...still...y'get the idea...
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