Quote from: freebit13 on February 01, 2014, 07:54:44 AM

Quote from: qqqpeter on February 01, 2014, 07:46:44 AM

Quote from: Gamer67 on January 31, 2014, 11:00:12 PM

Quote from: navigator on January 31, 2014, 10:56:51 PM

What kind of improvements do you see from adding a 2nd fan?

I'll go out on a limb here and say: It runs cooler.

How cool? I have also install 2nd fan. I have found one same as orginial...

After installing, hot air is pulled by 2nd fan, but from management page, show same temperature >:(and the rpm of the 1st fan become higher..., form 1900 to 2200?

Adding fans won't do too much unless you're maxing out the stock fan... all it will do is make the stock fan slow down due to pwm. If you add fans, it cools the boards and the temps drop and the stock fan will slow down until the temps rise to 40^o again.

If your fan speed has increased since adding the second fan then it sounds like it's causing more blockage than increased air flow.

If the chips reach 50^o and the stock fan is running at over 3000rpm then it would be time to add fans to keep it down to 40⁰ again.

I've added fans to my overclocked unit, but that's only to keep it quiet and I've added them on the outside blowing straight on the last 3/4 of the chips, it seems to produce better results

EDIT: P.S. if you want to drop the temps, then just remove the blue wire from the fan connection as mentioned further above and watch the temps drop to 30^o as the fans spins up to crazy speeds Grin

Thanks for reply, i was install this:

SCYTHE glide stream 120
36.3dBA
108.83CFM

As i think more cfm is better, then change to this:

NMB 12038 12V 1.3A Y4574 4715KL-04W-B56
50dBA
130CFM

The first one reduce the rpm, but the second increase the rpm..., i don't know why...?

Anyway, i have buy some heat sink online, and when the heat sink arrive and i install the heat sink to antminer, i will change back the fan to the first one or this:

14cm Viper R Fan
Max airflow 109.55 CFM
Sound level 7-21.7 dB(A)

http://www.akasa.com.tw/update.php?tpl=product/product.detail.tpl&no=181&type=Fans&type_sub=PWM%20Control&model=AK-FN073

as i found this post:

http://www.ebay.co.uk/itm/ANTMINER-S1-180-GH-s-RUNNING-AT-205-GH-s-ASIC-BITCOIN-MINER-750W-PSU-/301075381974?pt=UK_Computing_Other_Computing_Networking&hash=item46197dbed6&nma=true&si=4pcHMIE07kFbzmVdurd%252BIQgXZtU%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557

p.s. I put a switch for connect/disconnect the blue wire of orginial fan for sometimes may extra cooling or testing overclock...
http://www.cybtc.com/data/attachment/forum/201402/01/191909k8cog67ozeu4kwge.jpg