*nod* And running a few gh slower, matches what I saw with the cooler master. Oddly enough I am running two 7 chip jallies, one with the cooler master and a big heat sink on the back (60-70c), and one with a corsair water block on the back and the cheap BFL AL sink on the front (40c). The temp difference is quite impressive, but so is the value of cooling the back of the board as well as the chips.

Fun stuff.

Thanks for that picture. Your errors and submit ratios almost exactly match my unit, so I can say mine is working normally. I still am getting a good 39/36gh rate out of it with the water cooling heatsink, best $50 I have spent.

C

Update: Found my chip map. #6 is the chip top right with the board pointing up, power plug bottom left.

And like I'm going to sleep on this :-) Pulled the heat sink, sure enough chip 6 was the one that didn't float well enough. Due to having the back plate on when I soldered it. Moral: Bottom pre-heat is incredibly important. Cleaned the heat sink crap, put some liquid flux under it, 375 preheat then 450c for 90 seconds. Chip dropped as it should, is same plane as the others. Successful boot with the little power supply, remounted sinks, hashing happily at 27gh.

Thanks for the help. I'll always remember to ensure that plate is off...

C

Well darn, chip light 6 is unhappy. Where is that really nice map of all the chips again; I drew my own but I can't find it now.

C

Um. Yeah. That's what get rich quick is all about! GETTING RICH QUICK!

It's possible: I checked my notes and that jally had the back plate on it when i went from 6 to 7 chips. I use heat sink compound to put on the back plates, and in that case I forgot to remove it. So it got less pre-heat from the heating table, and it did take longer to make the chip "drop" into place. If it happens again I'll rework it, thanks to your diagram it's easy to find the right chip.

However it's at a happy 27gh for now so I'll let it be.

Thank you!

An H11. The old 11/03 in a 4 slot chassis. Yep, good little system; I ran a 4 user BBS using MU-BASIC back in the day.

Interesting note: I may have hit my first problem: My 7 chip air cooled jally was reporting 300gh speed, 26gh accepted. Slightly odd from the POV of BFGminer but when I unplugged it and plugged in again one chip didn't come up. Shut down, started again, back to 26gh.

I might be banging into a limit here. Without watercooling; maybe I should buy a small block for this one, or that one with only 5 chips....

C

Sure I'll measure the sides tonight. Oddly enough the holes in the corner fit the corsair PC mounting bracket with just the smallest amount of filing, so it's pretty close to a standard. The key is to cool the back of the board, the chips can deal with a heat sink.

I've got some old hardware myself, mostly pdp11's. For awhile there I kept the mit-ai.arpa system safe and sound before sending it over to Paul. Still have a KS10 out in the shed, I fire it up every once in awhile and think about what might have been....

Thank you! These things are definitely doing well, and once I get this other jally running (maybe) I will see about taking the two of them to 8 chips. Which will basically give me a single/60. :-)

As for the chips: I have had issues with the old style chips, specifically I was shorting one of them because heating from the top caused the solder holding the chip to the board to go molten. That's a big problem; it implies that one needs to use a reflow oven instead of a rework gun since the chip and carrier do not conduct the heat to the pads. However I am also finding out that leaving the board at 375f on the pre-heat board is enough to make the components almost "jiggly" so that even a small amount of heat can blow a component off the board. It might be possible to preheat the board to hell, then use something like 375c air to melt the balls. Maybe.

Ok, this is the ultimate Jalapeno. Does anyone think I should write a paper up on this and present it at Defcon or something? Without a doubt it explains why water cooling is God on wheels....

This is a Jalapeno running 7 chips, 28gh mining speed. Air cooled, 70c temp:



This is a Jalapeno running 7 chips, 28gh mining speed, water cooled, 40c temp.







It's been a long, interesting road to get to these units. All funded by bitcoins. :-)

Main thread documenting these little monsters is at: https://bitcointalk.org/index.php?topic=336782.0;topicseen

This is a Jalapeno running 7 chips, 28gh mining speed. Air cooled, 70c temp:



This is a Jalapeno running 7 chips, 28gh mining speed, water cooled, 40c temp.







I think if there's a Bitcoin conference I'd be happy to give a talk on hacking your bitcoin miner to full power. :-)

Actually maybe I should write something up and submit it to Defcon this year. It's fun, and they love this sort of stuff....

Yep, added an extra zero. .5 screen, .45 balls. Or maybe they are .5 balls but I think they're a bit smaller. Works well enough. Don't use too much heat to melt them on; I really cooked a few off on my second reballing. Oh well, clean and try again.

Double up the wires coming from your power supply; I tripled the 18 gauge wires together and they seem to hold. But the Corsair has 16 gauge wire by default and that thing runs all sorts of stuff. It's got an 8 chip chili, 7 chip air cooled, and 5 chip jalapeno. I think I'll move the water cooled 7 chip in there as well, or maybe another 5 chip unit. It's a very good power supply.

Wish I could get the danger jally up and going, seems to just fast-flash. Might be a firmware problem, I'll check that next.

C

Hm. If you want to reball them, I have at least three. .02btc each, unknown if they work (two probably do).

They seem to pull about 12-13 watts each, which at 1 volt is 12-13a. The original chip specs were supposed to be 8-10 watts each, that's where they ran into trouble. 8 10 amp units is 80a, 8 13a units is 104a. Big difference for power and heat dissipation.

The longboard has more space, better cooling, and FETs that can work together to share the load. Even with that they limit to 60gh, that's fair enough. But running the little single with 7 chips requires literally water cooling to handle the load.

I'd recommend not going past 5 chips to be honest. Six is do-able if you get heat sinks for the FETs. Seven rocks.

C

Well..... I've had a productive day.

First I added a second chip to my friend's jally, bringing it to 16gh. However this chip was a reballed unit; I used one of my old wrecked chips to learn on, figured out how to use the reballing tool and .050 screen (that's it) with .045 balls (bit smaller means less chance of shorting the damn thing), then took a chip I screwed up, reballed it, and put it on.

Worked perfectly.

Then I took another unit up to 6 chips, no problems, then took my air cooled jalapeno (the one with the cooler master fan) to 7 chips. Note: water cooling kicks more ass than God. I put a small piece of electrical tape over the vias, and just mounted the IBM X46 heat sink to the whole bottom of the board, and put the cooler master on top. It's running at 70c with all that sinking. The water cooled unit with *one* fan running on the radiator is at 45c.

Moral: Screw air cooled heat sinks. However this one is working, both are hashing at 27-28gh, and I'm done for the day. I still have two more chips I can reball, not sure where I will put them. I need more jallies. (no no no no no). :-)

So there you go: 6 chips can be handled by the stock fan and custom power supply. 4 chips is the max for the stock PS. Seven chips is for the men.

C

Need to wait for the sun to come up for a better picture, but you can see all seven lights a blinking....



Thinking about going to 8 this morning: The issue is the bottom of the board under the FETs is still hot. I mounted the block so that it uses the default BFL holes and the fan as the other side against the AL heat sink (brilliant!) however this requires a piece of electrical tape in there to insulate those stupid VIAs. That's cutting down on the block's cooling ability. But still I am concerned about the FETs going to 8. This might be as far as I want to go right now; if I blow the unit I lose 28gh of power.

Maybe I'll try boosting the air cooled one. BFL people: Any thoughts on how much more those FETs can handle?

Hm.... A thought: I wonder if I could tie two jallies together, one with only 4 chips, the other with 8 to balance the 1 volt loads. Why not?

Maybe I'll do that: Focus on getting the danger jally and the melted jally working, then try tying their power grids together.

C

Was running 75-80 with the bottom sink and top. Shut it down.

Now running at 40c. With a Corsair 100 water cooling block on the bottom.

This um.... solves the heat problem. The mounting is actually quite clever. Will go to 8 tomorrow.

Water is without a doubt the only way to fly.

Well, 2 more chips went on the five chip jally taking it to seven. Yes, 28gh. Yes, insane. Thoughts:

With 6 chips on the board I was hashing a good sold 24gh, and was able to keep the system cool with the aluminum heat sink, stock fan pointing down, and a bottom plate. Temps in the 60's. Note I have large heat sinks on the FETs and a fan pointing at the FETs and the FTDI chip.

With 7 chips, forget it. Temps were between 75 and 85 at which my BFGMiner throttles the work. Shut it down, put it on the Copper heat sink plate, fired it up. Temps now between 70 and 75, very hot but still running.

There is little doubt I need more cooling. Might try swapping the AL heat sink for the copper heat pipe one on my old 5 chip jally. 20gh is suddenly a lot slower, and now that I run it open as well, temps are not a problem. This though is really generating some warm.

We do need water cooling here to get to that magical 8 chips. It's funny seeing all the lights but one on the back of the jally burning brightly, that last LED is so lonely being off....

C

My little CPU miners have just mined their *first* catcoin. I earned it all by my little ole self :-)

In it for the haul.

C

Yeah, I saw that Eligus had a block that they chewed on for two *days*. This will start to make payouts less... predictable.

Ah well. Oddly enough difficulty has been crashingly stable these past few days, wonder what's going on.

C

Package received, everything there, thank you!

C