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What is the best way to control 54 or 88 corsair sp120 quiet fans? - Page 3

post #21 of 34
Thread Starter 
ok, it make sense i think, si i could use a splitter on the main controller. then on one of these i would have the normal 3 pin hooked up, then on the other 3 i would do something like cut the rpm cable? also would i only keep 1 'full' set of cables for a single fan connected with the others from that pcb plus the other pcb on the same channel all cut off?

man, im confusing myself... or would i have 1 pcb per channel and use splitters off that?

finally, what would i do with all the 2 pins? what are those used for?
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post #22 of 34
Let's say you want to control 24 fans on a single channel. Now, I don't know why you would want to do that but that's you.

You have to get two of the pcb splitters I linked.
But fans usually come with 3 wires. One is the rpm reporting wire (yellow I think) and the other two are the power wires.
23 fans will need to be feed power via the two power wires. And only ome fan per channel would be using the 3rd wire to report rpm back to the controller.

So you get one of these to connect the controller to your 3 pcb splitters. The SATA part is useless to us here.

You can cut or unplug the rpm wire on 23 of your fans and only one will have it's rpm reported back to the controller. Here your fans probably will all come with a 3 pin connector. Your pcb only has 4 3-pin connectors and an other 4 2-pin connectors. So on each pcb, you will have to change your fan connectors to 2-pin ones.

So you would have, on a single channel, 12 fans with their connectors changed from 3-pin to 2-pin.
You would have an other 11 fans using their original 3-pin connectors but with the rpm wire disconnected.
And finally, one lonely fan using all 3 pins to repirt rpm back to the controller.

The controller feeds power to the 3 pcb's via that splitter linked above.
The 3 pcb's feed two wire power to all fans, except one of them which will use the 3rd wire.

Does this make sense?
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post #23 of 34
Thread Starter 
kinda, 1 it may make it a little less weird, i plan to use a max of 16 per channel

si i would have 1 unmodded fan directly connected to the pcb. then the rest i would 'remove' the rpm connection and plug those into splitters which would then go into the remaining spots.

for the splitters, would these work? they dont have the sata

http://www.frozencpu.com/products/12591/cab-426/Phobya_Y_Cable_Splitter_-_3-Pin_to_4x_3-Pin_-_Black.html?tl=g2c251s635#blank

then would i connect as many of these to eachother until the required amout of connections has been reached?

If thats what you mean then i get it... its so hard to explain typing thinking.gif
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post #24 of 34
Quote:
Originally Posted by Radmanhs View Post

ok, i was wondering how many watts the ap-45's would require at startup? also can you really run 20 on one channel with what type of splitter? 2 way 3 way ect?

thanks

I've seen one email response from lamptron saying that a max of 10 ap-15s (with a total startup wattage of around 40w) can be used on a single 30w channel. I myself will be using 6 ap-45s on a single channel with a new fc5-v2 which is around 38w at startup in the next week or so. I'll report back if that results in melted silicone.

I'd also recommend looking at the lamptron fan-atic. It's a military switch type controller with something like 100w per channel, with the switch flipping from 5/7v (depending on the version you get) to off to 12v. So you can quite easily have a set of fans running on silent and pump them up to full speed with the flick of a switch when needed.

for reference the ap-15s use 0.36A on startup which means 4.32W per fan, AP-45s are 0.53A or 6.36W
Edited by Xephyron - 2/20/13 at 11:36pm
post #25 of 34
Thread Starter 
dangit... now im confused... one i want total control over the exact speeds, and 2 we were just talking about how you dont have to worry about that because it uses power modulation, not undervolting
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post #26 of 34
My claim of 20-25 fans per channel is only theoritical since I have never put that many fans on a single channel. The most I have tried is 16x AP-45 fans (two quad rads in push/pull) on a single 30w channel and I had no issues for the 2-3 hours I had it running. Take it for what it's worth.

Power modulation is just a fancy word for rapidly switching the power on and off. Basically, the Lamptron stops and starts your fans a hundred times per second. Even when I give it 5% power, the fans still start up, which is something an undervolting controller can't do because of starting voltage issues.
With the Lamptron, the starting up occurs a hundred times per second, therefore pretty much negating the starting current requirements.

But if you don't trust my recommendations, and that's okay if you don't, you can always get the Lamptron 9 which has 50w per channel. It doesn't have an auto feature but I don't think you will ever need to set your fans above 800 rpm anyway.
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post #27 of 34
http://www.overclock.net/t/1244949/two-questions

About the Lamptron 30w per channel claim. Is it starting watts or running watts? More info in link.....note the answer by the Lamptron support guy.
Edited by PepeLapiu - 2/21/13 at 9:57am
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post #28 of 34
Thread Starter 
ok, so i dont have to worry about starting watts , just running?

so i can put 16 1.5ish watt fans on a 30 watt controller? and then just lower the speed?
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post #29 of 34
In that case if lamptron support is saying startup watts isn't an issue then 16 fans aught to be fine, but you could email lamptron directly or ask in the lamptron section of the forum with the type of fan(s) you might want to use and they should give you a definitive answer.

As far as adding multiple fans to a channel, look at either the Phobya 3-pin y-cables on frozencpu (i think they go up to a 9x splitter) or have a look at the ModMyToy range of power distribution blocks. You can still 'daisy chain' multiple splitters to get to the desired number.

Edit- sorry, didn't see you already recommended those ModMyToys pcbs
Edited by Xephyron - 2/21/13 at 1:45pm
post #30 of 34
Here is my views on your proposed build: I think you need to slow down from the Tim Allen thing.

You are proposing 88 fans. If they are GT fans, that is around 1200$. I assume those will be in push/pull on rads.
So we are talking about 11 quad rads. That is an other 1000$ minimum, probably more around 1300$.
So you got 2500$ of fan/rads. And I have nothing against overkill. But I think you want to put a dual SLI on that. You might as well cut your fans and rads in half. With 40 fans and 120.20 of rads, you still beat my next build. But now you have a spare 1500$ to play with so you can get a quad sli for that spare money - two more VGAs that is.

A quad SLI with 5 quad rads is still way overkill, but at least you got more balance here. And with this kind of build, everything OCed, you will still expect a delta T below 5, probably around 1 or 2 is my guess.

Putting 11 quad rads on a dual SLI and CPU is akin to trying to fit a locomotive engine in a Pinto. At least get a pick up truck for that locomotive engine.
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