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[Xian01]

"Our older cards ran at a higher chip speed (55,56) and they worked fine.  Newer cards (voltage adjustable) need to run at a lower speed.  I think some customers are getting the wrong speeds, which will cause newer cards to overheat"

 Thanks. Have plenty of cooling on these guys, and have them situated in a Spotswood case. Will aim to do some tuning this weekend. Love the addition of the metallic areas on the back of the cards to help dissipate heat.

[allinvain]

One thing that does suck about these rigs is that they do not run very stable when fully populated (ie all 16 cards installed).

[bkpduke]

One thing that does suck about these rigs is that they do not run very stable when fully populated (ie all 16 cards installed).

This is very dependent upon power supplies.  You need a beefy PSU with stable 12V rails in order to keep the amperage even to all 16 cards.

[cypherdoc]

i keep getting ip conflicts with my multiple rigs.

anyone have a good strategy for avoiding this?

[allinvain]

One thing that does suck about these rigs is that they do not run very stable when fully populated (ie all 16 cards installed).

This is very dependent upon power supplies.  You need a beefy PSU with stable 12V rails in order to keep the amperage even to all 16 cards.

Hmm, do you have any recommendations. Believe it or not I'm running one full rig with a seasonic 550 watt 80 plus gold psu but I'm thinking of buying something more beefy. I have in mind the AX860 series.

[Doff]

Is it just me, or is this latest batch of rigs tuned lower than the previous v3's by default ?

Feel silly for sounding like I'm complaining, but my prior two rigs easily run north of 525GHs, and this latest one seems tuned for a steady 500GHs. Have not taken a multimeter to the latest cards to measure voltage yet. Probably will this weekend.

I just asked Dave that this morning:

"Our older cards ran at a higher chip speed (55,56) and they worked fine.  Newer cards (voltage adjustable) need to run at a lower speed.  I think some customers are getting the wrong speeds, which will cause newer cards to overheat"

Use voltmeter to check board voltage (recommended .8v). 
- Grab ground from any GND on the M-board
- Touch the red probe to the top of the Pulse inductor on the board
- You can even turn the screw while its plugged in and powered up

Is there any way to reliably do fail-over with the mining app Bob?

[bobcaticus]

One thing that does suck about these rigs is that they do not run very stable when fully populated (ie all 16 cards installed).

This is very dependent upon power supplies.  You need a beefy PSU with stable 12V rails in order to keep the amperage even to all 16 cards.

Hmm, do you have any recommendations. Believe it or not I'm running one full rig with a seasonic 550 watt 80 plus gold psu but I'm thinking of buying something more beefy. I have in mind the AX860 series.

The Seasonic 850w X Gold works really well.  We can't really recommend a certain brand, but I can highly say this works well 

[bobcaticus]

Is it just me, or is this latest batch of rigs tuned lower than the previous v3's by default ?

Feel silly for sounding like I'm complaining, but my prior two rigs easily run north of 525GHs, and this latest one seems tuned for a steady 500GHs. Have not taken a multimeter to the latest cards to measure voltage yet. Probably will this weekend.

I just asked Dave that this morning:

"Our older cards ran at a higher chip speed (55,56) and they worked fine.  Newer cards (voltage adjustable) need to run at a lower speed.  I think some customers are getting the wrong speeds, which will cause newer cards to overheat"

Use voltmeter to check board voltage (recommended .8v). 
- Grab ground from any GND on the M-board
- Touch the red probe to the top of the Pulse inductor on the board
- You can even turn the screw while its plugged in and powered up

Is there any way to reliably do fail-over with the mining app Bob?

I'm assuming with power?  You could in essence plug one unit into the pci-e and run another thru the wires at the other end.  I've been told you don't need to worry about over-juicing the M-board.

[tom99]

  maybe he/she meant mining s/w auto to backup pool.

[allinvain]

  maybe he/she meant mining s/w auto to backup pool.

You would have to use your own stratum proxy/gateway or use bfgminer. Chainminer by default does not offer failover support. On the miner's web page if you set multiple pools it just splits the workload.

[bobcaticus]

  maybe he/she meant mining s/w auto to backup pool.

as yes, as BTCGuild took a dive tonight.   I read something in the other 230 pages that went over the process.  I'm going to say that the other 2 fields in the proxy pool don't switch over when the main one goes down?

Personally, I went over to p2pool so I don't have to worry about anything... unless the cat unplugs my computer again.

[Xian01]

Believe it or not I'm running one full rig with a seasonic 550 watt 80 plus gold psu

 I suspect this is the cause of all your problems right here That's BARELY enough to power a full rig.

 I <3 anything Corsair in the 850W range for these guys.

[davecoin]

Just wanted to post about my chips on a new full rig. Results are on autotune.

Of 256 chips:

noncerate  = 0.000 = 2 chips
                < 0.250 = 2
                < 0.500 = 3
                < 1.000 = 2
                < 1.250 = 3
                < 1.500 = 1

That's 13 chips that are damn near worthless.  I have the rig stable up to 544 GH/s now, but I'm still bummed about the loss in hashrate. In contrast, my older full rig (Oct) has only 2 chips with a noncerate under 1.000 and has zero dead chips.

PSU: Corsair HX1050 Gold
Cooling: 20" Box Fan
    

[allinvain]

Believe it or not I'm running one full rig with a seasonic 550 watt 80 plus gold psu

 I suspect this is the cause of all your problems right here That's BARELY enough to power a full rig.

 I <3 anything Corsair in the 850W range for these guys.

I don't think that's true though. According to my power meter a full rig with v2.3 h-cards (the pci ones) is consuming 450 watts at 520 gh. 450 watts is at the wall of course.

But I still think that it would likely be better to give the power supply more room to breathe. Voltage ripple on the 12V rail is likely to occur more frequently at higher loads and the h-cards may not like this.

I think another solution would be to trim down the full rig by 4 h-cards. I was told by punin (from Bitfury Strikes Back -bfsb) that 12 h-cards is a more stable config.

[klondike_bar]

Just wanted to post about my chips on a new full rig. Results are on autotune.

Of 256 chips:

noncerate  = 0.000 = 2 chips
                < 0.250 = 2
                < 0.500 = 3
                < 1.000 = 2
                < 1.250 = 3
                < 1.500 = 1

That's 13 chips that are damn near worthless.  I have the rig stable up to 544 GH/s now, but I'm still bummed about the loss in hashrate. In contrast, my older full rig (Oct) has only 2 chips with a noncerate under 1.000 and has zero dead chips.

PSU: Corsair HX1050 Gold
Cooling: 20" Box Fan
    

544GH is quite a good speed though perhaps with time and tuning the bad cjips will come back on. I had a 'dead' chip on my september starter kit that suddenly began working after a few days of runiing at a higher voltage.

also, my 6 new V1.2 cards are modded to 1.7 kOhm on R02F and are running at 34.5GH average

[bkpduke]

One thing that does suck about these rigs is that they do not run very stable when fully populated (ie all 16 cards installed).

This is very dependent upon power supplies.  You need a beefy PSU with stable 12V rails in order to keep the amperage even to all 16 cards.

Hmm, do you have any recommendations. Believe it or not I'm running one full rig with a seasonic 550 watt 80 plus gold psu but I'm thinking of buying something more beefy. I have in mind the AX860 series.

Just pay close attention to the 12V rails.  I am using a couple older PC P&C 750W PSUs, but these are not built anymore.  I also have a 1KW Coolermaster Gold Series that I use to power two full rigs.

[bkpduke]

Believe it or not I'm running one full rig with a seasonic 550 watt 80 plus gold psu

 I suspect this is the cause of all your problems right here That's BARELY enough to power a full rig.

 I <3 anything Corsair in the 850W range for these guys.

I don't think that's true though. According to my power meter a full rig with v2.3 h-cards (the pci ones) is consuming 450 watts at 520 gh. 450 watts is at the wall of course.

But I still think that it would likely be better to give the power supply more room to breathe. Voltage ripple on the 12V rail is likely to occur more frequently at higher loads and the h-cards may not like this.

I think another solution would be to trim down the full rig by 4 h-cards. I was told by punin (from Bitfury Strikes Back -bfsb) that 12 h-cards is a more stable config.

Keep in mind that you are asking these PSUs to push all that power over the 12V PCI-Express power leads.  They were NOT designed to do this.  They were instead designed to push about 50% of their power over the main ATX connector to a motherboard.  That is why you need PSUs that are spec'd far above what the actual power draw is on a full rig -- the 12V rails for the PCI-Express power leads were never designed with that in mind.

[Doff]

  maybe he/she meant mining s/w auto to backup pool.

You would have to use your own stratum proxy/gateway or use bfgminer. Chainminer by default does not offer failover support. On the miner's web page if you set multiple pools it just splits the workload.

Yeah this is what I mean, sucks when a pool goes down. I suppose I could move over to p2pool as well, didn't know the miner worked with it.

[bobsag3]

Believe it or not I'm running one full rig with a seasonic 550 watt 80 plus gold psu

 I suspect this is the cause of all your problems right here That's BARELY enough to power a full rig.

 I <3 anything Corsair in the 850W range for these guys.

I don't think that's true though. According to my power meter a full rig with v2.3 h-cards (the pci ones) is consuming 450 watts at 520 gh. 450 watts is at the wall of course.

But I still think that it would likely be better to give the power supply more room to breathe. Voltage ripple on the 12V rail is likely to occur more frequently at higher loads and the h-cards may not like this.

I think another solution would be to trim down the full rig by 4 h-cards. I was told by punin (from Bitfury Strikes Back -bfsb) that 12 h-cards is a more stable config.

Keep in mind that you are asking these PSUs to push all that power over the 12V PCI-Express power leads.  They were NOT designed to do this.  They were instead designed to push about 50% of their power over the main ATX connector to a motherboard.  That is why you need PSUs that are spec'd far above what the actual power draw is on a full rig -- the 12V rails for the PCI-Express power leads were never designed with that in mind.

Several PSUs- like the EVGA 1300g2, can run almost their entire Amperage over PCIe. I think the evga can do almost 110A @ 12v, or 99.7% of its rated 1300w

[xzempt]

Just wanted to post about my chips on a new full rig. Results are on autotune.

Of 256 chips:

noncerate  = 0.000 = 2 chips
                < 0.250 = 2
                < 0.500 = 3
                < 1.000 = 2
                < 1.250 = 3
                < 1.500 = 1

That's 13 chips that are damn near worthless.  I have the rig stable up to 544 GH/s now, but I'm still bummed about the loss in hashrate. In contrast, my older full rig (Oct) has only 2 chips with a noncerate under 1.000 and has zero dead chips.

PSU: Corsair HX1050 Gold
Cooling: 20" Box Fan
    

544GH is quite a good speed though perhaps with time and tuning the bad cjips will come back on. I had a 'dead' chip on my september starter kit that suddenly began working after a few days of runiing at a higher voltage.

also, my 6 new V1.2 cards are modded to 1.7 kOhm on R02F and are running at 34.5GH average

Only in the world of bitcoin can someone promise 400ghs..... and have people Complain it only gets 544ghs....    i dont get it?    Bitfury and Megabigpower rock!