Topic: The Chili – 30+GH/s BFL based Bitcoin Miner Assembly - page 42. (Read 138054 times)

If your chili's are running at 60c then try this:-

Place a fan above the mosfets, the tempreature readout will go up to 70c and your hash rate will increase from 32Gh to at least 35Gh maybe even 38Gh.

The chili processors likes to run at 70c but to achieve this the power modules need cooling.

I'm hoping we see firmware updates soon. Mine are still hashing away nicely but it would be nice to see a small bump up in hash speed with any efficiency fixes. Plus I still have that one Chili that randomly hits 100% on bootup unless I powercycle and another that simply takes forever to boot up. I haven't needed to reboot anything for a week or two though.

I think right now all my Chilis are at 60C or thereabouts, maybe 70C at most.

Hello Mr. Teal,

you told in the past there was a problem with the board by mounting the asics.
What was the problem exactly? I understood the most of the tin-soldering-balls of the asic has to been flooded the holes completly or over the strip-lines?
I've only the photo in my mind which you post here. It looks a little bit there or the mask was not printed to the asic chip area to stop flooding the tin-solder over the whole strip line. In this case there is only a little bit missing of tin-solder.

I want to prevent me from this problem so maybe compensate the situation by a little bit soldering paste filled to the holes ?

Another question, as I understood in this discussions was not only the cooling of the chips is essential, also the cooling of the power chips is very essential. So it looks to me it must not be a big EVE 212 cooler needed only. Maybe a smaller is good, too but I should check that the power chips get there own heatsinks.
I plan to glue a heatsing on top and a big heatsink plate on the back for the power chip area.

I've now ordered two of the most more cheap Scythe Setsugen Rev. 2 Grafikkartenkühler VGA
https://www.google.de/images?output=search&sclient=psy-ab&q=Scythe+Setsugen+Rev.+2+Grafikkartenk%C3%BChler+VGA&gbv=1&sei=fjSHUuX_EMLItQam-oHACg&hl=de&sa=X&oi=image_result_group&ei=gDSHUr5_jcGzBsGUgOgK&ved=0CDIQsAQ
which could be buy in germany from < 22 € and plan to mount them in a way the air flow will be go through the top heatsinks of the power chips.
The heatsink itself is know to handle ~ 200 W which should be enough to cool the asics.
On the back I want to mount a heatsink as bfl did this with the little singles.

I hope it will work ;-)

But in fact, can anybod give me the mechanical dimension from the board and the holes so I can prepare/check my 19 Inch server rack case for mounting some of them? I would like to bring the case in a air conditioned server room which is only possible if I mount them in a server case as I allready did this with my knc miners ;-)
I want to calculate how much asics I can mount in one case. I think 5 should been possible but I need
clarify that.

Cheers...

It's pretty normal.

Remember, we're actually reading the die temperature as opposed to a board temperature like BFL is doing. The temperatures are going to be higher than you would see with see on a comparable BFL device and way higher than you'd see on something like an Avalon that thermocouple glued to the heatsink.

is 70c a good temp for these boards?

Depends on volume, but probably not. A lot of it will depend on what kind of price you can get for the ASICs themselves, as at list price they're more than everything else combined. For our part of it, an order of 100 boards is enough that it takes you out of the very expense realm you pay for runs of 10-20 or so for prototypes and the ludicrously expensive cost of doing a few, but it's not nearly enough to get down to even the costs we saw in our first batch (which was 3x larger than our second batch).

Maybe wait until you're all set up (since making setting up a new one is more efficient that fixing an old one), but you might want to reseat the heatsink on the one that's running at 23GH/s. It's very likely that it's throttling due to poor temps on one of the chips.

  thanks for the boards. we have had 4 out of the 13 assembled and running. 23gh, 36gh, 34gh and 39gh so far. when we get the rest of the heatsinks on and the rack set up I will put up a pic or two. we are running them with thermal paste only using the twin turbo ii coolers with lots of small heat sinks on the back side and one 90mm fan on the back side heat sinks.

Can the prices for end users be lowered enough to make it more enticing?  I know there are some required costs like manufacturing, etc...

I would guess at least 100 boards or so.

What would it take for there to be a batch 3?

Thanks Brimstone. It was definitely a challenge but I'm really glad we were able to get your issues resolved.



On another note, after we closed batch 2 orders we had some excess boards without ASICs, so we teamed up with CanaryInTheMine to get them all built up with the intent to sell them off.
The those units are now for sale in the auction subforum.
https://bitcointalksearch.org/topic/new-bfl-based-chili-miners-30ghs-nominal-334841

Thank you both once again for making this happen.  I know it was a ton of work but the results are fantastic!

If you want to see them in action, here is a photo you will either like or cringe when you see.

-BrimStone

Mr. Teal & ChipGeek,

Thank you both!

My two Chili against a Little-Single.
BAL 0  is the LS.


BAL  0:  max 48C 3.27V | 31.24G/31.33Gh/s | A:  235213 R: 1250 HW:     896 WU: 435.0/m
BAL  1:  max 60C 3.29V | 34.38G/34.33Gh/s | A:  230372 R:   624 HW: 32387 WU: 419.2/m
BAL  2:  max 63C 3.29V | 40.38G/40.34Gh/s | A:  277958 R:   697 HW: 25154 WU: 516.9/m

75%-finished 

Alright, the vast majority of batch 2 is out now. Thanks for everyone who bought boards in this round, it definitely didn't go as smooth as I would have liked with the PCB problems, but in the end it worked out pretty well.

Check your email.

How's everything going with the production? It's been quiet so I assume that's good.

I managed 42Gh for 10 mins

evo 212,   with extra 80 mm fan on mosfets.(gets another 5Gh)

Ambient background about 0c.   Then I had to close the window. (G** its cold outside)

European winter, in a well ventilated outhouse, is my proposed mining facility.