First post here so please be kind!
I had a few hours yesterday morning and gave myself a little 4th of July holiday challenge:
1.Take a few of my Blizzards/Furies from my mini-farm.
2.With ONLY a tray of various screws/wires, thermal paste, and some mini-heatsinks, use the parts that make-up the stock units and reconfigure the design to:
A. Consolidate cooling.
B. Consolidate size.
C. (Hopefully) improve performance.
3.Enjoy a nice cold Hefeweizen and whistle while I work!
(Items also present on my work bench = Weller soldering iron + solder, razor blade, Phillips head, and hex head drivers)
After repasting and improving the PCB to aluminum casing thermal transfer, the mini-heatsinks were applied to each individual ASIC. Next, I combined the V+ input of each set of (2) miner boards before running a new power feed line to the rear of each pair. I then soldered one of the available fans to one of the available PCB's. Everything is now reinstalled in to each cashing set and joined with the original fan housing bolts, which are also used to [temporarily] secure the now vertically mounted blower-fans. Just for extra cooling assurance, one of the other extra fans is plugged in to the stock location on the PCB and retained on the top of my "mini-tower of 5.5MH/s power" by seating it so its mount holes securely rest on the union bolt/nut tips. Lastly, to keep each pair of miners level, two M3x40mm hex-head bolts w/ nylon lock nuts are used in place of the (2) rear PCB mount screws on the lower miner of each pair. Now each pair of miners can be stacked and hooked up!
My opinion of the results: Veni, vidi, vici!
Overall, the units are running cooler and I can see approximately a 10-15% improvement in hashing effectiveness - including less HW errors (only approx. 10 over a range of 1000 accepted shares with less than 5 rejected shares). I am going to continue to test and see how it does over the weekend.
Update: Now I have 8 units made into 2 towers. Numbers @ 340MHz are looking good (see below).
Scott-
I have a question did u try to add 3 units together and have the 120mm fan blow on it ?
i wanted to try this maybe tomorrow but wanted to see why u did the 2 in 1 method