Quote from: tom_o on June 24, 2013, 05:44:48 PM

Quote from: gpufreak on June 24, 2013, 04:19:11 PM

Hi,

To my understanding ASIC's are application specific and thus requires me to have an ASIC designed for my specific goals. As my code'] implicates highly non-standard calculations (no double sha) a far cheaper goal would be to go with GPU's. My goal is to build a 32 GPU cluster. Each node with 4x 7990 = 8 GPU's so with 4 machine's I'm all set.

Now only the cooling is an issue which I think would be solved by using water cooling (chillers) instead of open-air systems and heavy A/C units.

You wouldn't need a water chiller, much simpler design for 4x7990 would be a triple liang dcc and dual/triple 480mm radiator setup. Then you don't have to worry about chiller control etc.

1 x Thread Laing DDC Triple Acrylic Pump Top : Plexi
3 x Laing DDC-1T Pro Pump 440 L/hr 10W
2-4 x Swiftech MCR420XP Extreme Performance 480mm Quad Radiator
8-16 x Zalman ZM-F3 120 x 120 x 25mm 1800RPM Case Fan

plus the waterblocks for your graphics cards, some tubing and some high quality hose clamps. T line is much easier than using a reservoir and means there is less to spill if something goes wrong, I'd still recommend distilled water and some kind of anti-conductive additive though.

Although expensive it should keep the cards at a delta between 10-20 degrees max compared to ambient air at full load depending on how many radiators you decide to use.

Get a silver kill coil and distilled water to handle any biocide requirements. What is an anti-conductive additive? Short of using something like fluorinert I don't think there is a way to prevent the water from ionizing given the constant contact with copper.