Cooler Jalapeno Modifications

[natbyte]

After stripping my Jalapeno for cooler running, firstly removing the case and flipping the fan over so the air is now pushed down over the heatsink, I took a laser thermometer to all the chips on the board, and the hottest chips on the board were the MOSFETS (currently without heatsinks in my picture the two groups of 6 chips) as I am still crafting these to fit, however I have cooled the ADP1850 and surrounding chips, these were all pushing over 50 degrees C, they now run much cooler. Currently the MOSFETS are 65+ degrees C, so these will be next for some heatsinking.

From my initial observations my hashing seems solid around 5.6Gh/s before cooling hashing jumped around from 5.00Gh/s to 5.8Gh/s frequently, it now appears to have found it's own sweet spot. It is too early to see if the cooling is the key factor in this increased stability, however I am confident the lower temps are helping prolong the life of the hardware.

[SirMintALot]

Hey, that looks great. Good work 

[Svennisen]

Nice, where do you buy your heatsinks?

[pickoff]

Now it's time for overclock

[waveydave]

Do you know if this is one of the 'hot MOSFET' units? More recent units run cooler so hoping I can avoid dealing with heat/fan noise by the time I get mine.

[vm1990]

Do you know if this is one of the 'hot MOSFET' units? More recent units run cooler so hoping I can avoid dealing with heat/fan noise by the time I get mine.

u believe it would be as they have only just received the revised boards, as BFL said they are shipping boards out that arnt quite to the spec they wanted 'hot MOSFET' i think when they do get it sorted they will go back to the small cases and stuff

[waveydave]

u believe it would be as they have only just received the revised boards, as BFL said they are shipping boards out that arnt quite to the spec they wanted 'hot MOSFET' i think when they do get it sorted they will go back to the small cases and stuff

I haven't seen that they'll return to the smaller cases. I suspect there is still too much heat from the 2 ASIC chips themselves at 25-35W (some have the 2GH/s upgrade) to forgo the heatsink.

[vm1990]

i dont know maybe theyll come out with a 2.5 then... after all they do have alot of the old cases and board around hell id take 2 2.5s if i didnt have to wait XD

[natbyte]

In my opinion this is the hot MOSFET board, 65+ degrees C is hot I've now installed heat sinks on one bank of 6 MOSFETs just the other six left to cool. The board is still the revision C board, so its the latest.

Due to heat I do not think with the current chips they will ever fit this into the original slimline cases.

The heat sinks are forged copper, actually used for a Raspberry Pi however they can be modded to fit these chips easily. See here Forged Copper Raspberry Pi heatsinks

I will post my updated pictures into the thread so you can see the overall cooling of all the chips.

[waveydave]

i dont know maybe theyll come out with a 2.5 then... after all they do have alot of the old cases and board around hell id take 2 2.5s if i didnt have to wait XD

Bearing in mind the original Jalapeno was to be 4.5 GH/s running on under 5W USB power without additional cooling, at the current specs to run on less than 5W means it wouldn't run at more than 1 GH/s. Even the best estimate for the chips at 3W per GH/s doesn't give much more than 1.5 GH/s, but there are additional components required for it to even work.

Even so, on that basis they could easily compete with the 300 MH/s USB devices from ASICMiner. If they can do a 1 GH/s USB powered miner for under $150 I've no doubt it'd sell pretty well.

[US Andy]

Did BFL release any of the faster units yet?