Thanks CrazyGuy, I now have 4 prismas connected to one BE cube that is chugging away the past 2 hours now without problems. I needed the dip switch info for sure. Straight forward install, everything there and even a few extra cables. Sweet more stuff for the parts drawer.
![](https://ip.bitcointalk.org/?u=https%3A%2F%2Fi.imgur.com%2F5iDscc7.jpg&t=665&c=kQk2YPs3Ca-u9A)
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Apologies for the dark pic. But you can see I am powering 4 prismas using two stacked 2000watt IBM DPS2000BB power supplies with Sidehack's awesome breakout board and his cables 1 PCI-E per hashing board (which I admit are a little long for this layout). Cables are not hot or warmer than outside environment. I had a little mishap that involved grounding metal to some parts of a hashing board with pops and sparks but that board is chugging away anyhow
![Grin](https://bitcointalk.org/Smileys/default/grin.gif)
The tubes do give off a lot of heat, more than the S3 for sure, but just a bit more than a S1. Most of the heat is coming from the stacked power supplies pushing ~4500watts combined. (not confirmed soon I will obtain some recycled PDU's that meter each outlet
![Cool](https://bitcointalk.org/Smileys/default/cool.gif)
) I used the two fans that came with my older S2 kit for the power supplies, one to push, one to pull. One just one wasn't enough it would overheat and shut off.
Pool side reporting 5.7Ths past 1hour, difficulty at 4096.
try setting them to freq 230. I did extensive testing and used the short tubes for about a month.
your numbers show me that you are running too hot. and maybe under powered. you can tell by your
Real Performance: 5482.83GHS vs
Expected Performance: 5898.24GHS
92.96%
If you have enough power and are cool enough you run at 98 to 101%.
here I am overclocked with 2 short tubes. but I used 2 fans and had robust power supply overclock was 280 vs 270 stock
![](https://ip.bitcointalk.org/?u=http%3A%2F%2Fimagizer.imageshack.us%2Fv2%2F1280x1024q90%2F902%2FiSQ6wq.png&t=665&c=fJiy3WAaOPzelA)
here is a 290 clock. using two fans and handles out not in
![](https://ip.bitcointalk.org/?u=http%3A%2F%2Fimagizer.imageshack.us%2Fv2%2F1280x1024q90%2F901%2F1iZycr.png&t=665&c=rohCMY94YU2Icw)
second fan added handles out. handles out takes heat further away from the chips. no question 2 fans and handles out helps units to be cooler.
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