Quote from: Xtra7973 on November 02, 2014, 04:30:50 PM

Quote from: PlanetCrypto on November 02, 2014, 03:01:04 PM

Quote from: bobsag3 on November 01, 2014, 10:07:58 PM

Quote from: candcfarms on November 01, 2014, 08:30:09 PM

would it be safe to do that mod on the dps2000 and run two prismas?

You shouldn't have a problem.
The DPS1200s power 1 Prisma each without a problem. as well as 2x Dell 750

bobsaq3 and sidehack are spot on at stock/factory clock rates.
We prefer to allow a little more head room for OC'ing the Prisma's and hence have migrated to one DPS-1600BB per Prisma.
OC'ing a Prisma only makes financial sense if the cost per Kwh is low ($0.08/KWh or less).

Then there are the heat dissipation issues that come with filling a room/Data Center with OC'ed Prisma's.
Pursuant to that we are prototyping Open Bath Immersion (OBI) cooling using the 3M Novec Engineered Fluids in custom built polycarbonate immersion tanks.
With the ultimate goal of immersing 32 OC'ed Prisma hash boards, controlled by an RPi w/wireless, in an OBI tank powered by 5 DPS-2000's.
Power consumption should be ~10Kw per tank and dissipate ~32K BTU continuously, enough to heat the average American sized home in a Minnesota winter AND GET PAID TO DO IT.
The residual/excess heat could be used to heat a garage, heat a driveway, heat sidewalks, melt snow off of the roof, heat a pool/hot tub/fish pond, etc. . . . . . .

Our Youtube channel (PlanetCrypto) has some videos of our initial testing.

Initial testing of 24x Tube Erupter boards in a Walmart fishtank:
http://www.youtube.com/watch?v=meOf0FJBkGA
http://www.youtube.com/watch?v=y_yfHJ8yoh8

A polycarbonate immersion tank with 2x Bitmain S3+ hash boards:
http://www.youtube.com/watch?v=gcb9TyQP5ZA
http://www.youtube.com/watch?v=fStHV_Q-x7s

We no longer power the fan in the S3+ tank as it is not required for condensation.
The heat generated from the S3+ tank supplements the in-floor heat in our little DC.
We have laid PEX in the ground outside the DC as a place to dump excess heat in upcoming expanded systems.

When we get a 32 Prisma board system up and running we'll post some vid's on the channel.

Great videos, thanks for sharing. Thats a great setup you got going there. Awsome way to heat your house in Minnesota. Just out of curiosity what was your source of heat before? Im sure its cold there now and just wondering how the heat from your mining setup is going and if you had to turn the old way to heat the house on yet? Also I would like to know your energy savings compared to last year, or whenever before you started that setup. Really looking forward to the Prisma videos, thanks for sharing.

Have heated with everything under the sun (fuel oil, propane, electric base board, wood, wood pellets, Bitmain S1's (currently), immersion cooled Prisma's (future).

January heating bills:
Electric baseboard 3 years ago = $550/month (electrical cost per KWh has risen since then).
Wood pellets = $110-$120/month
S1's = positive cash flow (i.e they generate more revenue than they use in electricity, breakeven on the S1's is USD/BTC ~$300 @ current difficulty @ $0.08/KWh).

As a heating device I'm allowed to run these off of electricity billed at the "Dual Fuel" rate (>$0.08/KWh) versus the "Regular Service" rate ($0.1168/KWh).

Have friends serviced by a different electric company that run their S1's at the "Off Peak" rate ($0.04/KWh). During the day they open windows to exhaust the excess heat and keep the house at a comfy 80F. At night they close most of the windows to maintain the desired temp.

7 S1's are currently providing a 50F+ delta T from outside temp (~30F) with one 20" box fan exhausting heat from a second floor window. And the pellet stove/furnace hasn't kicked on yet.
As the temps continue to drop (it gets to -30F+ here in the winter), I'll turn off the fan and close the window, then move an appropriate number of S1's into the house from the DC to compensate (i.e create a larger Delta T from outside temp). Going forward, the Prisma's are the heater of choice as their $/GH/s is far better than the S1's/S3's.