Chilling my Jalapenos [ Chill + Flash: 7.2 >> 8.15GH]

[peterepeat]

Aren't you worried about a layer of frozen water condensing on the electronics?

Not really - I only chill it for 10 minutes in the freezer. I guess it gets the PCB to around 5 to 10 °C. Also its winter here at the moment so I will worry about condensation issues later on.

the ideal temperature seems to be between 5 and 10 °C
I tried it again this morning and chilled them for about 10 minutes only in the freezer, then run in ambient temperature of about 18°C
They have been running for about 2 hours now - the 7.75 is actually stable now at 7.98GH/s, the other one is still stable at 7.62GH/s

http://imgur.com/CgQ3YIT

so now its actually a 960MH/s bonus - just like getting 3 ASICMiner USB for free

(disclaimer - this may have other consequences so research first, and consider your ambient environment)

[GalaxyASIC]

While working on better cooling solution for my own ASIC, that is still months away, I put together a rig that can keep hashers very cold and keep moisture in the air away from electronics, so condensation is no a problem. This could be applied to BFL miners and I have four of my own 60GH units on order for 4-5 month now, but have to wait till BFL gets up to speed. Buying a 5Gh unit from someone who has it on hand for 15X it's price seems too much since I get my own relatively soon. But I want to test the cooling solution that I have developed.

I have to see if cost of cooling them makes a good business for hosting other people's units, but for now I just want to test how well it works and need a loaner units for about two weeks and I will fully reimburse hashing loses and pay for overnight Fedex shipping both ways. I am in New York city.

You can still mine on your own account from my lab, I just want to see how well it could be cooled. Upside? you get faster hashing unit and make more BTC.

[xgtele]

No Frost fridge is seems fine for your Jallies   

[peterepeat]

Aren't you worried about a layer of frozen water condensing on the electronics?

Not really - I only chill it for 10 minutes in the freezer. I guess it gets the PCB to around 5 to 10 °C. Also its winter here at the moment so I will worry about condensation issues later on.

the ideal temperature seems to be between 5 and 10 °C
I tried it again this morning and chilled them for about 10 minutes only in the freezer, then run in ambient temperature of about 18°C
They have been running for about 2 hours now - the 7.75 is actually stable now at 7.98GH/s, the other one is still stable at 7.62GH/s

http://imgur.com/CgQ3YIT

so now its actually a 960MH/s bonus - just like getting 3 ASICMiner USB for free

(disclaimer - this may have other consequences so research first, and consider your ambient environment)

Just to expand on this, I have now flashed my Jalapenos with the BFL released BitforceSC 1.2.5 firmware and found the 10 minute chill to still be effective.
New speeds: 7.98 improved to 8.18 and 7.62 is now 8.11

so now is 16.29 total hash rate with the pre-chill and new firmware (was around 16.0 without the pre-chill)

[philips]

Just to expand on this, I have now flashed my Jalapenos with the BFL released BitforceSC 1.2.5 firmware and found the 10 minute chill to still be effective.
New speeds: 7.98 improved to 8.18 and 7.62 is now 8.11
so now is 16.29 total hash rate with the pre-chill and new firmware (was around 16.0 without the pre-chill)

You might try the one modified by ckolivas:
https://bitcointalk.org/index.php?topic=244235.msg2602712#msg2602712
Plus info:
https://bitcointalk.org/index.php?topic=244235.msg2623529#msg2623529

[peterepeat]

Just to expand on this, I have now flashed my Jalapenos with the BFL released BitforceSC 1.2.5 firmware and found the 10 minute chill to still be effective.
New speeds: 7.98 improved to 8.18 and 7.62 is now 8.11
so now is 16.29 total hash rate with the pre-chill and new firmware (was around 16.0 without the pre-chill)

You might try the one modified by ckolivas:
https://bitcointalk.org/index.php?topic=244235.msg2602712#msg2602712
Plus info:
https://bitcointalk.org/index.php?topic=244235.msg2623529#msg2623529

thanks - I havent tried that one yet. I did try setting
#define __ASIC_FREQUENCY_ACTUAL_INDEX   8
and flashed that, however I was getting 1000s of errors so I went back

http://imgur.com/peKactI

[philips]

Worth trying.
His modifications consists in relaxing the start-up tests.

Just comment out these lines in ASIC_Engine.c

Code:

					if (iReadBackNonceCount < 4)
					{
						// This engine is DEAD!
						bWasAnyEngineDecommissioned = TRUE;
						DECOMMISSION_PROCESSOR(cDiagChip, cDiagEngine);
					}

Then it won't decommission any engines regardless. My firmware was slightly more conservative and made sure the engine returned at least one valid nonce.

[peterepeat]

Worth trying.
His modifications consists in relaxing the start-up tests.

Just comment out these lines in ASIC_Engine.c

Code:

					if (iReadBackNonceCount < 4)
					{
						// This engine is DEAD!
						bWasAnyEngineDecommissioned = TRUE;
						DECOMMISSION_PROCESSOR(cDiagChip, cDiagEngine);
					}

Then it won't decommission any engines regardless. My firmware was slightly more conservative and made sure the engine returned at least one valid nonce.

I will give this a go (just need to get the AVR dragon back - its away for a week or so)

[TheSwede75]

Someone should just try throwing their Jalapeno in a deep-freezer and mining @ -20C. I am serious, I want to see results

[rustyh17]

Someone should just try throwing their Jalapeno in a deep-freezer and mining @ -20C. I am serious, I want to see results

Just spray on a little bit of this:

http://www.neverwet.com/videos-news.php#

Click on the CONFORMAL COATINGS video link....

[Gomeler]

Someone should just try throwing their Jalapeno in a deep-freezer and mining @ -20C. I am serious, I want to see results

If I had one I would. I did all sorts of refrigeration cooling things when I was overclocking CPUs and GPUs with the culmination of a failed 3 stage cascade. If the jalapeno had software voltage control it could really open up some interesting testing. I'd prefer though a single chip PCB like the test PCBs that were used for Bitfury testing. Could be fun seeing how the chips perform down at -100 Celsius

[peterepeat]

Update - the slower unit after 24h is back to 7.9 GH. I tried chill technique and no improvement. Back to firmware tweaking again

[bitpop]

What software is that picture?

Just to expand on this, I have now flashed my Jalapenos with the BFL released BitforceSC 1.2.5 firmware and found the 10 minute chill to still be effective.
New speeds: 7.98 improved to 8.18 and 7.62 is now 8.11
so now is 16.29 total hash rate with the pre-chill and new firmware (was around 16.0 without the pre-chill)

You might try the one modified by ckolivas:
https://bitcointalk.org/index.php?topic=244235.msg2602712#msg2602712
Plus info:
https://bitcointalk.org/index.php?topic=244235.msg2623529#msg2623529

thanks - I havent tried that one yet. I did try setting
#define __ASIC_FREQUENCY_ACTUAL_INDEX   8
and flashed that, however I was getting 1000s of errors so I went back

http://imgur.com/peKactI

[peterepeat]

What software is that picture?

Just to expand on this, I have now flashed my Jalapenos with the BFL released BitforceSC 1.2.5 firmware and found the 10 minute chill to still be effective.
New speeds: 7.98 improved to 8.18 and 7.62 is now 8.11
so now is 16.29 total hash rate with the pre-chill and new firmware (was around 16.0 without the pre-chill)

You might try the one modified by ckolivas:
https://bitcointalk.org/index.php?topic=244235.msg2602712#msg2602712
Plus info:
https://bitcointalk.org/index.php?topic=244235.msg2623529#msg2623529

thanks - I havent tried that one yet. I did try setting
#define __ASIC_FREQUENCY_ACTUAL_INDEX   8
and flashed that, however I was getting 1000s of errors so I went back

http://imgur.com/peKactI

It's cgwatcher, a miner supervisor app.