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[Doff]

I did that actually, but I am still having issues with it. It made them stay up a tad longer before they started dropping off.

[Doff]

I bought a Multimeter to be able to check the voltage, however I do not know where on the board you would test that.  If someone could make a screenshot of that I would really appreciate it, or maybe it already exists?

I have tried all sorts of fans and none seem to keep the regulator cool enough to keep them from cycling. Mine just turn off as well, and do not come back up.

Check voltage on top of the inductor (grey box with PULSE printed on it and any of the GND pin from the PCIE power supply)

Ahh, that's how you do it. Thank you.

[Soros Shorts]

Add sinks ... and reduce STRESS in your life .

I don't know about that ... sticking on $400 worth of tiny heatsinks per rig was a pretty stressful and time consuming experience for me. I wish somebody would make custom heatsinks for these.

[goxed]

Add sinks ... and reduce STRESS in your life .

I don't know about that ... sticking on $400 worth of tiny heatsinks per rig was a pretty stressful and time consuming experience for me. I wish somebody would make custom heatsinks for these.

It's a one time exercise, and then peace of mind.

$400 :O They usually sell for $40 good for 4 cards. Actually, I realized after sometime that heatsinking only the bottom 2 rows is sufficient to keep the regulator cool.
I see that heat-sinks you used are a different that the VGA RAM sinks.  

[tacotime]

More updates on my bad card:

- No matter what I do it will shut off within 5 minutes of beginning mining, although it does not throw a lot of errors while it is mining.
- The shutdown is a slow taper in noncerate to about 10 GH/s, after which is hits 0 GH/s.  After this the board does not restart.
- Heatsinking the board like crazy has no effect and thermal diode readings all over the voltage regulators max out at 45C when you start it up, so it's not any kind of heat issue
- Manually setting the clock speed has no effect
- Board position has no effect

At this point I'm just going to say it's a bad board and needs to be RMA'd unfortunately.  Dave, will you accept RMAs with heatsinks on them?

[goxed]

More updates on my bad card:

- No matter what I do it will shut off within 5 minutes of beginning mining, although it does not throw a lot of errors while it is mining.
- The shutdown is a slow taper in noncerate to about 10 GH/s, after which is hits 0 GH/s.  After this the board does not restart.
- Heatsinking the board like crazy has no effect and thermal diode readings all over the voltage regulators max out at 45C when you start it up, so it's not any kind of heat issue
- Manually setting the clock speed has no effect
- Board position has no effect

At this point I'm just going to say it's a bad board and needs to be RMA'd unfortunately.  Dave, will you accept RMAs with heatsinks on them?

Can you please post a picture, front and back side? I had a card performing similarly, I carefully monitored the power consumed by the card. It was ~70 watts. Had to reduce the voltage a bit to make it reliable.

[tom99]

Yeah so that one board is still bad.  Keeps shutting itself off even if I downclock it so the onboard temps are only 30-40C.  I guess I'll have to talk to dave about RMAing it.  This happens no matter what slot it's in.

Same thing happened to me, chips were cool enough. Turned out that the power regulator was too hot, despite heatsinks (I measured 90°C with IR-Thermometer). I moved the 3 fans from the top to the side of the regulator, which helped a lot. Now my 10 Boards are stable at 345-355 GH/s.

Aren't these new H-cards supposed to have trim pots that would allow you to reduce the voltage output of the regulator? The voltage preset at the factory may just be a little too high for your operating environment. This symptom was common with the August H-cards if you "over pencil mod" them. I have yet to receive my Oct kits, but if this were to happen to mine I would try reducing the voltage a little on those cards that were shutting down.

   Yes, newer Hboard got SMD trim pot on it.

[Keefe]

I bought a Multimeter to be able to check the voltage, however I do not know where on the board you would test that.  If someone could make a screenshot of that I would really appreciate it, or maybe it already exists?

I have tried all sorts of fans and none seem to keep the regulator cool enough to keep them from cycling. Mine just turn off as well, and do not come back up.

Check voltage on top of the inductor (grey box with PULSE printed on it and any of the GND pin from the PCIE power supply)

Just FYI... There is a small problem with measuring voltage like that, but it's still the easiest way in a crowded rig. There's a significant and varying voltage drop on the ground line between the power supply and a card. Just between the M-board's GND terminal and a slot's ground pins, there's a drop of between 0.023v (slot 0) and 0.067v (slot F) on my v1 rig. So while it may look like you're running a card at 0.900v when measured the easy way, it could actually be as low as 0.833v. And I didn't even account for any further drop from the slot to the chips' ground plane.

[Keefe]

If you donot add heatsinks to the regulator area, cards will cycle. The real point of adding heatsinks to the ASIC is to keep the regulator cool. Add sinks to the regulator and atleast the bottom 2 rows of ASICS and reduce STRESS in your life .
BTW, I also did another mod, but I will not advise anyone to do that unless they know what they are doing. It's obvious if you look at my H-card very carefully.

Ah, I think I see what you did. The thin wire over the fuse? Is that supposed to break if the fuse trips, so you can see that it happened?

[tacotime]

More updates on my bad card:

- No matter what I do it will shut off within 5 minutes of beginning mining, although it does not throw a lot of errors while it is mining.
- The shutdown is a slow taper in noncerate to about 10 GH/s, after which is hits 0 GH/s.  After this the board does not restart.
- Heatsinking the board like crazy has no effect and thermal diode readings all over the voltage regulators max out at 45C when you start it up, so it's not any kind of heat issue
- Manually setting the clock speed has no effect
- Board position has no effect

At this point I'm just going to say it's a bad board and needs to be RMA'd unfortunately.  Dave, will you accept RMAs with heatsinks on them?

Can you please post a picture, front and back side? I had a card performing similarly, I carefully monitored the power consumed by the card. It was ~70 watts. Had to reduce the voltage a bit to make it reliable.

Sure, just a minute.  I checked the voltage (Inductor +, GRND -), 0.862 V for this card versus and average of 0.860 V for the other cards, so the voltage is apparently not the issue.

[tacotime]

Okay, shots of the busted board and the rest of the rig are here: http://imgur.com/a/WCu0k

The heatsinks on the bottom left of the card look close to some of the live voltage regulation points, but I can ensure you that it is not touching them

Edit: Sent in RMA request, let's see how smooth this goes! 

[Doff]

Okay, shots of the busted board and the rest of the rig are here: http://imgur.com/a/WCu0k

The heatsinks on the bottom left of the card look close to some of the live voltage regulation points, but I can ensure you that it is not touching them

Edit: Sent in RMA request, let's see how smooth this goes! 

Well at the moment I am pretty frustrated and unsure what to do. I am getting about 372 with a full rig, 5 cards sitting at 0, 1 at 8gh. I have a box fan on them, plus 6 120MM fans, and Heat sinks as Goxed recommended. I was very careful not to let them touch anything they shouldn't, However none of that has helped, 5-6 cards just poop out after an hour or so of mining.

Not sure how to proceed at this point. I sent in an RMA to see if Mega can help.

[tacotime]

Okay, shots of the busted board and the rest of the rig are here: http://imgur.com/a/WCu0k

The heatsinks on the bottom left of the card look close to some of the live voltage regulation points, but I can ensure you that it is not touching them

Edit: Sent in RMA request, let's see how smooth this goes!  

Well at the moment I am pretty frustrated and unsure what to do. I am getting about 372 with a full rig, 5 cards sitting at 0, 1 at 8gh. I have a box fan on them, plus 6 120MM fans, and Heat sinks as Goxed recommended. I was very careful not to let them touch anything they shouldn't, However none of that has helped, 5-6 cards just poop out after an hour or so of mining.

Not sure how to proceed at this point. I sent in an RMA to see if Mega can help.

Sounds like the same problem I am having with my bad card.  The only thing I can think of is something faulty with the thermal regulation.  Weirdly, sometimes when I ssh the chips are all fine, other times they throw errors.  My guess is that they are all fine, but something is faulty elsewhere in the board.

The only other thing I can recommend is reseating them all over the place and seeing if it helps.

[kaerf]

Tacotime, have u tried undervolting with a pencil? "Pencil mod" the resistor above the R01f resistor (don't remember the number). It should reduce the voltage and is easily reversible.

[tacotime]

Tacotime, have u tried undervolting with a pencil? "Pencil mod" the resistor above the R01f resistor (don't remember the number). It should reduce the voltage and is easily reversible.

These have adjustable pots on them, but I don't think I'm going to bother... all the other boards hash stably at 0.860 V for 12 h now, why shouldn't this one?

The board also gives as valid nonces for a few minutes as all the other ones at 33+ GH/s, it just clocks down and then shuts off like clockwork each time.

[Doff]

Okay, shots of the busted board and the rest of the rig are here: http://imgur.com/a/WCu0k

The heatsinks on the bottom left of the card look close to some of the live voltage regulation points, but I can ensure you that it is not touching them

Edit: Sent in RMA request, let's see how smooth this goes!  

Well at the moment I am pretty frustrated and unsure what to do. I am getting about 372 with a full rig, 5 cards sitting at 0, 1 at 8gh. I have a box fan on them, plus 6 120MM fans, and Heat sinks as Goxed recommended. I was very careful not to let them touch anything they shouldn't, However none of that has helped, 5-6 cards just poop out after an hour or so of mining.

Not sure how to proceed at this point. I sent in an RMA to see if Mega can help.

Sounds like the same problem I am having with my bad card.  The only thing I can think of is something faulty with the thermal regulation.  Weirdly, sometimes when I ssh the chips are all fine, other times they throw errors.  My guess is that they are all fine, but something is faulty elsewhere in the board.

The only other thing I can recommend is reseating them all over the place and seeing if it helps.

Ill definitely try that once I am able to. I have moved the worst ones to the end of the m-board, maybe I should mix them in to the middle and see if I can find a sweet spot.

[CoinHoarder]

Any updates? I'm still waiting on two October orders.

[wpgdeez]

You could try running the bad card on its own using different slots to see if there are any changes in stability between them.

[buzzdave]

Hi guys - a couple quick notes on some of the themes I've been seeing in emails & forum threads:

-new cards are factory overclocked to .865v.  You shouldn't have to turn them up from there - though you could turn them down if you want.
-a fully overclocked rig will do 575G - 600G with proper cooling.  By proper, I mean use the three fan power headers on the M-board.  Point an additional box fan at it for good measure.  Don't run it in a 90-degree basement
-if your rig is too hot, you will see cards thermal-cycling.  Hashrate will be good, then drop to zero or very low for a while, then go high, back to zero, etc.

The mining software has been tuned for the V3 rigs.  Basically the speed parameter is turned down from 55 to 52.  Here's a link to the V3 chainminer software:
https://www.dropbox.com/sh/qtykkb1tyosbykw/CVrcVszQyy

A link to the new image is coming soon - this has the changes Jared made for the network settings and the smart IP assignment bits.

I've disabled store sales - we've still got old-style H-cards and M-boards, as well as V3 stuff, but new prices are coming.  As soon as I put the wraps on the accounting for the last cycle, we'll put up more product at the new (much) lower prices.

The credit card merchant account continues to be "almost activated".  I've been told repeatedly that there are no blocking problems, but the process is slow.  Makes me wish I could use Stripe  I hope to have credit card processing in place prior to opening new store sales.

Thanks for your patience and emails of support!
Regards,
Dave

[buzzdave]

Okay, shots of the busted board and the rest of the rig are here: http://imgur.com/a/WCu0k

The heatsinks on the bottom left of the card look close to some of the live voltage regulation points, but I can ensure you that it is not touching them

Edit: Sent in RMA request, let's see how smooth this goes!  

Well at the moment I am pretty frustrated and unsure what to do. I am getting about 372 with a full rig, 5 cards sitting at 0, 1 at 8gh. I have a box fan on them, plus 6 120MM fans, and Heat sinks as Goxed recommended. I was very careful not to let them touch anything they shouldn't, However none of that has helped, 5-6 cards just poop out after an hour or so of mining.

Not sure how to proceed at this point. I sent in an RMA to see if Mega can help.

Sounds like the same problem I am having with my bad card.  The only thing I can think of is something faulty with the thermal regulation.  Weirdly, sometimes when I ssh the chips are all fine, other times they throw errors.  My guess is that they are all fine, but something is faulty elsewhere in the board.

The only other thing I can recommend is reseating them all over the place and seeing if it helps.

Ill definitely try that once I am able to. I have moved the worst ones to the end of the m-board, maybe I should mix them in to the middle and see if I can find a sweet spot.

One thing worth looking at is the .stat.log - its located here: /run/shm/.stat.log - at the bottom is a card summary.  If you are seeing high miso-err or spi-err from a card, its introducing noise.  That card will drag down any cards following it in its bank.  Try placing that card in the last position of any bank and it shouldn't affect its neighbors.  If it still won't play nice, RMA it - log into your megabigpower.com account and go through the Returns process.

Dave