Thought i'd post some pictures of my "Ducted" low profile setup that is in progress.  I have a low table in my work area with about 6" of space underneath it and I thought I would design a rectangular enclosure that maximized airflow via a wind tunnel design while minimizing noise (I removed 80% of the fans).

Here is the first quadrant put into place.  Note the units still mounting fans are slightly recessed in for noise mitigation and after checking airflow I realized that 4 fans per quadrant was overkill and reduced it to only 2(visible in later pics):


Here it is with the second quadrant filled:


I'm now ready to start setting up the rear quadrants and have positioned the miners with fans at the front of each stack.  The overall airflow with the lid on is actually pretty decent.


Here is the view from the "front" or intake.  The overall dimensions are 36" L x 20" W x 5" H and the ducts for the miners that run down the centerline are 12" in length.


There are currently 40 miners running and I will be working to clean up the wiring a bit more with zip ties.  There are 8 cables that come out each end (6 power and 2 ethernet) and are plugged into power strips which are then connected to a 500watt UPS (single mode mining only!).  The ethernet cables plug into a 4 port wireless bridge which connects back to my gateway router in the living room.

Hope you guys enjoy the pics and it sparks some ideas of your own!

-Eric

P.S.  Total cost for materials was about $40

Straighten me out on something here.
I've been following the rumors, comments, assertions etc. on btc for some time now and only tonight decided to take a deeper more critical look at it.
What I understand thus far, makes me ask...
Why is it not profitable to mine with the GC3355 5 chip miners?
From what the calculations on coinwarz.com shows, mining btc is way more profitable than mining LTC or any other scrypt coin for that matter.
Doesn't coinwarz's calculator take into consideration that btc is mined by thousands with super duper TH/s rigs?
Why the great skepticism on mining btc anymore?
Still, I read others posts about running antminers at only a few 1.6GH/s rates making profits of 6 to 8 bucks per day.What's so bad about that?
I mean,with 10 ant miners, one can theoretically earn $60/$80 per day. WTF is wrong with that? That't way better than mining Scryptcoins, not to say Scrypt isn't worth mining but it is indeed, worth - less.
So I don't get it since our beloved dual miners will run many times this rate - per pod -...making one up to hundreds of dollars per day!
I'm a little bit confused!
A little help by someone well versed and experienced on the subject of btc mining with ASICs or even GPU's,, if necessary Mining is mining. We ALL can mine BTC, in any case. Not ALL can mine the same types of Script. Obvious but, interesting.
Thanks!
Wolfey2014

I'm running them in that 2U case, Done many hours of testing the past week. I have them here in my office running right next to me. If you want temps etc, just let me know.
They are running almost ice cold in that case.... 800 clock.
Notice, I turned them upside down, they run cooler that way. I know you are wondering why, I think its because it uses the floor of the case as a giant heatsink.
I use an infra ray to measure temps. 90F for each cell in there, thats cold...
REMEMBER LTC ONLY!!!!!
-Bobby

Has nothing to do with what anyone thinks, it's like you'd ask us if we think 1+1 equals 2.
RAM will only matter if you're using Reaper as your mining software, otherwise (using cgminer, sgminer, etc) it has really minimal effect on your rig and you can easily run your mining rig with as little as 2GB of RAM.

The only reason adding RAM solves anyone's problem is because they misconfigured their rig to begin with.

Right before I bought my R9 290s I searched the forum a lot about the card and I remember seeing a whole thread with dozens of replies saying how the R9 290s require a lot of RAM for them to work properly (and I mean a lot - 8 to 16GB lol). I then got lucky enough to chat with a guy who has a big mining farm with a few R9 290 and he told me he doesn't need more than 2GB to run any of his rigs.

Needless to say, once I got my R9 290s I got them to work flawlessly with 4GB of RAM (which I already had from an old PC - if I'd buy, I'd buy only 2GB) and when you check system processes you can see that less than 2GB is being used at any given time.

Scrypt: about 990Kh with very few rejects/no hardware errors. Did some benchmarking and even though there's the occasional reject (less than 1% mining 24 hours), happy with keeping it at 990Kh. Runs at around 78C at 65% fan.

N-Scrypt: about 440Kh with no rejects/no hardware errors. Runs at around 70C at 50% fan.

CPU is 4770k with 16 GB RAM

And oh yeah, I run Ubuntu from a USB stick. But maybe occasionally boot up Win 8.1. Speeds are similar but Linux requires less reboots when restarting CGMiner. Windows tends to do BSOD when CGMiner is closed, probably because of the OC-ed GPU returning to normal

What motherboard, what OS, what pool? 3-5% might be perfectly fine depending on where you are mining and what your ping to the stratum server is.

That's just bizarre... I run all my rigs with 4GB of ram - I have never believed the more RAM helps story, because cgminer uses hardly any RAM.  I usually have 90% free RAM with 4GB.

Very nice!

more info, ie is it openair case ?

mobo? spec ? os? etc etc

Have you tried Linux?  I hated the 290s on Windows, drivers were horrible.

Are these 290X or just 290s?  Once you get them stable, try The Stilt's BIOS so you can drop the memclocks down to 1375 but keep the same performance, and gives you more headroom on the gpu-engine.  If all of your cards run at 1500 memclock without crashing, then try pushing the engine up to 1060 - when a card goes sick, decrease only that card's engine by 10.

xintensity will increase your hashrate, period.  No reason not to use it.  What's not to like about a way better way to tune the number of threads launched that actually lines up with your number of shaders?