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I would use a bigger fan, the top row of chips is not cooled enough with 120mm.
I have good experience with this expensive 180mm one: http://www.newegg.com/Product/Product.aspx?Item=N82E16835220048&cm_re=AP182-_-35-220-048-_-Product
And put the whole construction on its side, to prevent wobbling of the boards.

Very efficient miner as far as watts. Space on the other hand is going to be fairly large. For a USA buyer the price seems very high. Almost double the rbox again I know it draws about half the power but still....  All in all interesting product that I will keep an eye on and consider adding to my home mining.

Steve

It requires such little airflow it makes no difference, and you risk damaging the connectors mounting them on their sides.

?? I have the original M-board and H-cards running like this for over half a year, no more issues since then.

Or you can put something under fan, something which is like 3 to 5 cm high, so the fan covers all the H-Board/chips.

I have a test-setups with 10 H-boards, one of them is put upside down, this is stable, fan in perfect position for cooling.
(sorry for the bad quality picture, old iphone)

http://s21.postimg.org/6588uvh1j/yiazo_ybf_test_setup.jpg

Updated prizes: https://bitcointalk.org/index.php?topic=647102.40

M-board and H-board now 75 euro (a piece)

These great miners are still available !

This is a test-setup of our YBF SHA256 (Bitcoin) Miner. 1 YBF-M Bitfury miner mainbord + 5 YBF14S-H Bitfury mining boards. Hashpower 150 up to 190 GH/s at ±116W at 12V input. Fans are Scythe Slip Stream SY1225SL12-series 120mm, 2x 500rpm. Using these fans you have enough cooling for the miningboards and listen how incredible low noise this miner is.

Enjoy the silence: https://vimeo.com/99945192

http://s2.postimg.org/v9vpwcdll/Schermafbeelding_2014_07_04_om_22_17_13.pnghttp://s7.postimg.org/6p8uysjsr/Schermafbeelding_2014_07_04_om_22_18_24.png

Pity these are so overpriced... the performance / watt is one of the best I've seen...
Are these chips really this efficient? Or is this design using more chips at much lower voltage to get power usage down? That would explain the price...

Mixture of both. Bitfury chips have always had exceptional power draw.

*** BIG SALE **

https://bitcointalk.org/index.php?topic=697102.0

YBF 90+ GH/s Miner set 1x YBF-M + 3x YBF-H NOW = 70 euro
YBF 150+ GH/s Miner set 1x YBF-M + 5x YBF-H NOW = 110 euro
YBF 300+ GH/s Miner set 1x YBF-M + 10x YBF-H NOW = 210 euro

Please order at our website yiazo.com (http://www.yiazo.com). We accept BTC (thru Bitpay) and Euro - Banktransfer SEPA

http://s21.postimg.org/azdghma6v/Schermafbeelding_2014_11_06_om_21_40_19.png

Very good, but the prices should be even lower for these mining sets to be competitive with modern mining equipment, keeping in mind all inconveniences of your mining sets...

"inconveniences"  ???

It is small / compact
Very power efficient
Very stable 99,5+% efficiency at miningpool (BTCGuild) *
Very low noise
Efficient airflow
Easy to setup

I don't want to all this inconveniences

* screenshot from BTCGuild of one our own miners (currently offline)
http://s1.postimg.org/owp0nx0lr/Schermafbeelding_2014_11_07_om_00_58_11.png

Power efficient?.. Approximately 0.625 W/Gh as I see... 0.52 at best, if this 300+ set will hash at 380 Gh/s consuming 200 Wt... Well, may be... Moreover: "With roughly 20w per board, a loaded controller will clock in at 200w to 300w depending on how fast the individual boards are running and what type of fans are connected as well". Let's think that it will consume 300 Wt and hash at 300 Gh/s... 1 Wt per 1 Gh?..  :D  Where are the real test results?..

Let's compare with AntMiner S4. A set of 7 of your 300Gh sets (to achieve 2.1 Th, because where is the guarantee that it will give constant 380 Gh/s?) costs 1470 EUR and does not include PSU(s) and fans. Let's add to this price a shipping cost... It is curious, but looking not so profitable comparing to S4. At best it looks like S4 in terms of profitability, but...

Look at the test from July 4th: 150 up to 190 GHs at 116W = 0.7733 to 0.6105. Avarage that = 0.69W/GH. The nice thing is you can "play" with power efficiency when you have a adjustable powersupply. As long as input is between 11V and 13V the miner is stable (with proper cooling): you can play with powerdraw and hashpower.

And you are right about the S4 and S3 and other miners, they are nice too and I am not saying it is crap of unefficient. I personally also bought, tested and mined with Bitmaintech, KNC, Bitmain, Zeus and other miners, they all work and all have their (dis)advantages but such a stable, efficient and low noise miner as the Yiazo-YBF is I and other who have bought the Yiazo YBF, have never seen and expericiened before.

(sorry about my crappy English sometimes  :P)

Oh, yeah, now I see the test.  ::)

It's OK, my English is not ideal too.  ;D