I'm thinking that we need someone to conduct a Fluid and Thermo Dynamics course here.  LOL remove the plastic... It's just like water only it flows upwards..... Like this........ a new rig just finished  Maybe I should add some plastic to actually DIRECT the fans over the heatinks |
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POP off that PSU cover and re-wire the cable in SEVERAL 15-30A cables.
Remember ohm's law resistors in parallel....
The holes in the PCB's are big enough, just cable tie the cable BEFORE soldering so you don't rip the pads.
Most PVC cables are rates at 90 Deg. c , problem is.. they start giving off toxic chemicals at about 60.
Lead is used in a BIG way when they manufacture PVC cable.....,
its also used in the copper wire... so wash your hands after handling PVC cable.
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I've been mining with some 7K325T-1 parts running the KC705 code clocked at 300MHz for a couple of weeks now. I notice that the hash rate starts to drop off after a day and a half and I have to restart the miners to get it to come back up. Has anyone else seen this?
you really need to slap some BIG heat sinks and BIG blowers on there. Had a similar issue with the Xilinx development board, even with a blower, lifted off the Mickey mouse heat-sink.. dropped on one twice as tall and now it sits at about 53 deg.c but it is CRITICAL you cool the SM PSU modules as well, I notices as they get hot... they drift UPWARDS!!! taking the core-voltage out of spec and causing further serious heating of the FPGA (not to mention its possible destruction.....) Which is why I had to throw in a 'system monitor" for both voltage and core temp...... then I had to split out the CLK for the communication & the logic separately and gate the SHA256 logic to the sys monitor..... (you cannot just gate the CLK, because it controls the FPGA internal function .. including the sys monitor...) Then I dropped some mini heat-sinks (for ram chips) on-top of the inductors for the SM PSU and the thing is stable even at 40 deg c ambient!!! |
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Worst. Setup. Ever. Its like offering to instruct someone how to cut off their own penis.
With a blunt knife..... Take a product likely to catch on fire... put it in a highly inflammable petroleum product, finally stack it on a cotton carpet with a real wood floor underneath..... why are you troling  just so you know i dont have carpets in my comp room and its fake wood ontop of concrete It is not a troll idiot boy... some people just don't know the risk...... http://www.scmp.com/news/hong-kong/article/1212060/fire-breaks-out-south-horizons-one-injuredThese are also 'fake' wooden floors over concrete, not to mention the smoke is what kills, 1 PVC crate in a small area is already enough to kill a family.... |
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there are a few pins spare....... Just tag on a serial port... 5 minute job.... |
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Ok, I saw this article. I have a list of questions, here they are: - 1. It says they are shipping now, and I want to get my hand on one. If I order on Monday next week, about when will my order arrive?
- 2. What will the difficulty be?
In a year, what will the difficulty be about? - 3. Will it be profitable? And for how long?
I used this calculator and with a difficulty of 20000000.0 and the rate at 100.00/BTC. It seems profitable, (My definition of 'profitable' is about 400.00 a month), how long will it remain like this?
I am in a rush now, so I will add more in an hour. Be right Back! The difficulty is ALREADY 15,000,000 think more 200,000,000 and you may be a bit closer........ Currently it is changing UPWARD at about 30-40% a MONTH!!!!! |
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I'd REALLY like to do one with liquid Gallium.... with a graphite assembly cooling plate..
Mercury would be too much of a problem if you had a leak.......
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Worst. Setup. Ever. Its like offering to instruct someone how to cut off their own penis.
With a blunt knife..... Take a product likely to catch on fire... put it in a highly inflammable petroleum product, finally stack it on a cotton carpet with a real wood floor underneath..... |
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Also I believe you watercool with Distilled Water. Leaks are bad yes but Distilled water inst a conductor until it becomes dirty?
Absolutely 100% PURE water with ZERO contaminants and NO gasses is actually an insulator.(good luck on getting it outside of a specially constructed laboratory) But no... that does not include distilled water... (actually you would be frightened at the amount of shite in "distilled water" non-laboratory grade) You use distilled water to reduce galvanic corrosion & oxides forming in the tubes, but good luck on it staying 'distilled'. A minute layer of oxide reduces heat transfer efficiency. (see furry kettle) You should stick to a similar metal across all blocks in the system or you run a risk of severe corrosion as aluminum and copper react badly It is called galvanic corrosion and occurs frequently in shitty kits that mix metals (or cheap china made 'copper'), a single dissimilar metal is enough to kick it off... |
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CPU overheats..... threads cut back.... increasing fan speed reduces CPU temperature... threads expand to use available CPU.
Nubie conclusion....
bitcoind uses fan speed to validate block chain....
Reality...
cool CPU's can go faster.
Stupidity is like Nuclear waste... you don't want to get any on you or near you....
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Isn't Bitcoin designed for anonymity? Why would you want to undermine that?
No it is not...... Transactions are traceable..... |
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The Forum needs a range of tags.
Including a "stupidity" tag.
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It is actually quite interesting on a number of levels.
Normally such a paper would be frowned upon, because most of the citations are at least 10 years out of date and as for going back to 1957 for reference material... very dodgy..... esp. as there has been a lot of work in probability theory since then.
It is as if the citations were 'thrown' in as an afterthought with an underlying lack of research.
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Why would you want too?
The main reason for grounding is electrical safety, I.E to provide an integrated environment, where electrical goods can operate within a safety cage.
Then the US goes and does something stupid like have 2 pin plugs!!!! (which are reversible....)... hay let's not even put the Live feed through a fuse safely..... (if the fuse is on the neutral line and it blows... then the equipment is STILL tied LIVE!!!)
First, decide WHY you want to do it... then get back to us.
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I'm working on blog post, for something about the same cost @200MH/s, but my shipment of boards is stuck.......... |
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I don't have a desktop computer, just a laptop.
I'm searching the web for some USB FPGA cards, like Cairnsmore, Ztex, Terasic and so on that i would like to use with my BitMinter account.
None of these cards could be a good investment for me?
Theirs cost is under USD 1,000.
No they would be a VERY BAD investment for you. go here: http://tpbitcalc.appspot.comType in the details, BUT remember that the difficulty is generally changing about 9-13% UP each month.... It would take AT LEAST a year to regain your investment(if you ever do). Far better you take that $1,000 buy bitcoins and sell with a 10% change, that way you make 10% in a week or so........ Wait for it to fall 10% re-buy.... then sell with a 10% gain..... (5-8% is currently the swing on bitcoins in a DAY...) If you are good then you could make 100% of your money in a few months, just because the cash is burning a hole in your pocket no need to do something stupid...... |
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It is tom selling his crap.
Sad state of affairs considering I just picked up >2GH for $300USD........
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Check the version number on the FPGA.
you can do it by reading the chip ID.
I have found a MASSIVE difference in power/heat & speed using the SAME part numbers and specs and bitfiles, but on reading the internal chip details the FPGA's have different revision numbers.......
Just wondering if Xilinx lets very high grade parts thru as lower grade when they are running short.....
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