Office space not cheap here also, unless got cheap data center with unmetered power
Must see how many interested. Anyway no need big space, just need area to put there. Not as if need place to walk around, sleep etc |
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didnt know there's a singapore thread here
to all my fellow singaporeans
SONG BO?
I dun think very Song, you know the electricity costs here lor  anyway i also want to see how many avalon, BFL users are there here. considering renting a small office space with aircon so can mine in peace and 24/7 aircon |
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didnt know there's a singapore thread here
to all my fellow singaporeans
SONG BO?
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Yes. I also invite you to have a look at the manufacturing drawing I published  the reason for asking is because though yr diagram states g1/4 the pictures are too small, i can't see if there are screw threads or not. just trying to clarify that's all |
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i'm designing a waterblock for the avalons and I noticed that there are some differences in terms of number of mounting holes for batches 1,2,3
batch 1 has 5 holes for the header board
batch 2?
batch 3 has 4
batch 1 has 8 but only 6 used mounting holes to the case
batch 2,3 ??
my question is, while there are differences in number of mounting holes are they compatible? in other words, do they align together?
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Try a different firmware. I have migrated all my avalons away from that version. Same issue.
i have no idea whether i should do that or not since the avalon users thread reports users with bricked units or unstable issues. |
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Do the fans stop when this happens?
nope. they continue spinning, that's why i had a huge shock when i checke my btcguild status page and it says last share was 6hrs ago. when the miner stops hasing, it reboots and the elaspe timer resets but the hashrate, temps and fan speeds all show 0 |
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I believe it might be something in a recent firmware. I too had this occur, perfectly stable machine for days on end, then decided it wasn't happy. Would restart several times, then get stuck on 100% hardware until physically restarted. Then back to happy happy happy.
i havent updated the firmware it was the one that came with the unit and it was hashing for 25hrs continuously at 1 point. I shut it down to add some fans or tried changing the temp threshold the only things i changed was the rear fans, adding thermal paste to the heatsink and case. |
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need some help
for some reason, the miner has been stoppping every now and then and refuses to restart mining unless i manually power down.
it was running at 350mhz for sometime and running fine. so i tried running at 355mhz but it stops every few hours so i lowered it to 350mhz
firmware: 20130703
when the miner stops hasing, it reboots and the elaspe timer resets but the hashrate, temps and fan speeds all show 0
as for cooling, i've added heatsinks to the side of the case (where the main heatsinks are mounted), added thermal paste between the main heatsinks and case (the contact between the heatsinks and case) and added 2 exhaust fans
6hrs ago it stopped mining when i checked the miner's page, the time elasped was just 1min, meaning the miner had restarted a min ago. so for 6hrs, it was doing nothing?
I mean, so 1 min ago, it restarted on its own but not yet hashing?
what was it doing during the 6hrs and why isn't it restarting and hashing?
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are u making this for manufacturing?
If you tell me a desired volume I can get you quote. For delivery cost I would need a location. Do you need the water blocks only or the whole system? are those g 1/4" threads on the fittings? |
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Having some problems with the avalon again.
need some help
for some reason, the miner has been stoppping every now and then and refuses to restart mining unless i manually power down.
it was running at 350mhz for sometime and running fine. so i tried running at 355mhz but it stops every few hours so i lowered it to 350mhz
as for cooling, i've added heatsinks to the side of the case (where the main heatsinks are mounted), added thermal paste between the main heatsinks and case (the contact between the heatsinks and case) and added 2 exhaust fans
6hrs ago it stopped mining when i checked the miner's page, the time elasped was just 1min, meaning the miner had restarted a min ago. so for 6hrs, it was doing nothing?
I mean, so 1 min ago, it restarted on its own but not yet hashing?
what was it doing during the 6hrs and why isn't it restarting and hashing?
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anyway
having problems drawing just the basic diagram
bloody sketchup giving me so much problems/
thought i was done with the mountinh holes then i realised sketchup placed the holes floating in the middle of nowhere or it somehow thinks a column has a line that cuts it into 2
till this day they dont allow users to create a line or a circle by inputting the dimensions instead of dragging it to size.
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Hey there,
Mechanical engineer with fluid dynamics background. There is no simple answer to your question it depends on too much factors. (i.e. pipe diameter, total length, fluid velocity, pipe material, etc..)
You should consider making finite elements analysis for optimal results. If you can't afford this, you'll have to make tests.
Here are the things you should consider:
Try to get as much as possible pipe contact with the heated area AND the cooling area.
Smaller diameter pipe combine with longer length configuration are often more optimal.
Try to get as much velocity as possible in the pipes. At a certain point, fluid is moving in a turbulence mode where heat transfer is optimal.
My personal advice would be the second option. The first one can create areas of stagnate fluid which can cause overheating on that area.
what if the edges and corners are curved for first diagram? |
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are u making this for manufacturing?
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Which board are you designing the block for?
As a place to start, the parallel (ladder) approach is theoretically better, since the serial (snake) approach does not offer the same cooling on the outlet side as it does at the inlet (the water picks up heat as it travels through the snake). It's also much more restrictive, which can be a problem unless you're using a true positive-displacement pump (you're not). The Bitcoin Catalog pointed out the possible problems with the parallel approach.
If it helps, most high volume/high viscosity systems tend to be parallel (car radiators), while low volume/low viscosity serial (Air conditioner heat exchangers).
Have fun.
designing it to cool the avalons ok where can i get rubber gaskets to fit the waterblock? |
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ok i am designing a waterblock. not too keen with the current designs with parallel tubes and curved pipes. Does the top part of the board need to be actively cooled as well? if so then i will extend the pipes there. anyway which flow design is better, what are it's properties like pressure loss, effects on flow rate, etc   for the 2nd pic, if it's better i intend to add fins along the way instead of just curved pipes. |
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whoa that wire mod looks sick...
do you think w/o an overvolt that more consistent voltage will help HW% errors drop and thus a bit higher clock even at stock voltage? cuz that mod seems simple enough.
Yup. JFET transistors act like tiny capacitors when they're closed - the current doesn't actually stop flowing until the capacitor is 'charged'. And of course more volts means faster charge time. On the other hand, of course, it means more heat, and more risk of damaging your chips... Just the wire mod for consistent voltage risks damaging the chips?! ... I would think the more consistent voltage has little / no chance of damage to chips w/ stock cooling.. I know its obvious a mod like 1.34v risks damaging / overheating chips if not properly cooled, but wasnt thinking about doing that. Just the wire mode for tad more clockspeed cuz of the more consistent voltages. I think my cooling setup should handle it fine (5k rpm 250cfm fans) Just adding a wire (assuming done correctly) will have no chance of damaging your chips. However if you have never soldered to electronics before I recommend leaving the board as is. where exactly have you soldered the 2 points? i dont see the r10 resistor anywhere on the first pic. |
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anyone tried removing the rear panel for batch 1 and lowers temp?
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Batch#: 1
Modules:4
PowerSupply: 1250w Seasonic Gold Modular
Extra CoolingSetup: $20 Box Fan directed at the hotter side.
27-28 degC Ambient A/C Room Temp.
added 36 small heatsinks to the hotter side.
added 2 panaflo 120mm 104cfm fans at the back (psu is external)
added some electrical tape to help funnel air to heatsinks instead of going above/over the heatsinks.
[Firmware Version] => 20130723
Chip Frequency(Default: Advance): 350(insane); 354 is actual read out.
More Options(Default: --quiet):--avalon- 52 or 54
HashRate: 105-120gh/s
Additional Info(whatever I may have missed): added rubber grommets to the rear fans. not done to the front fans as it involves total shutdown of unit.
Uptime: depends. i occasionally let it cool down for a moment or i shut it down to perform mods or changes,etc
future mods:
adding thermal paste between heatsinks and case
changing thermal paste between the chips and heatsinks to something better like mx-4?
adding grommets to the front fans
cutting the side panel to mount an acrylic window for viewing/monitoring and easy access if needed.
lining edges of panels with rubber lining for noise insulation
lining internal panels with noise absorbent mats.
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I really don't understand how people's units get so hot. Mine run at 49C with minimum fan rpms (nearly)
how cold is your room in the first place? Ambient 22-28 well maybe not the entire civilised world is in the US, so of us have ambient temps higher than that |
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