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[tom99]

Nice results, goxed.  What voltage are your boards at (once they're heated)?

The boards with good chips are at 0.9V, the ones with >=2 bad chips are at 0.95V

   OC to .95V overkilled and must have heatsink + fan.

[klondike_bar]

Nice results, goxed.  What voltage are your boards at (once they're heated)?

The boards with good chips are at 0.9V, the ones with >=2 bad chips are at 0.95V

impressive. I cant get past 0.88v (39-41GH per board) without having chips or boards drop to 0 hashrate or produce massive3 error rates time to time

[goxed]

Nice results, goxed.  What voltage are your boards at (once they're heated)?

The boards with good chips are at 0.9V, the ones with >=2 bad chips are at 0.95V

impressive. I cant get past 0.88v (39-41GH per board) without having chips or boards drop to 0 hashrate or produce massive3 error rates time to time

are you using heatsinks? especially on the regulator and the lower half of the board? I have put up a reference picture in this thread. if you copy that you should get the board up to 0.9v provided there's good airflow.

[goxed]

Nice results, goxed.  What voltage are your boards at (once they're heated)?

The boards with good chips are at 0.9V, the ones with >=2 bad chips are at 0.95V

   OC to .95V overkilled and must have heatsink + fan.

Depends, I have atleast 2 chips that are dead at anything less. Infact they are happy at 1.0V as well, but the regulator approaches its limits.

[klondike_bar]

Nice results, goxed.  What voltage are your boards at (once they're heated)?

The boards with good chips are at 0.9V, the ones with >=2 bad chips are at 0.95V

impressive. I cant get past 0.88v (39-41GH per board) without having chips or boards drop to 0 hashrate or produce massive3 error rates time to time

are you using heatsinks? especially on the regulator and the lower half of the board? I have put up a reference picture in this thread. if you copy that you should get the board up to 0.9v provided there's good airflow.

I have good heatsinks but perhaps could use slightly larger ones on the regulator/inductor. 0.865-0.87 is good for 40GH on my boards, but the pencil mod ramps up to maximum (or minimum?) resistance over a few days and its difficult to get the exact balance. once it climbs to >0.88v the boards become unstable and i see high error rates followed by entire boards or just some of the chips dropping to 0 every few hours and upkeep is a PITA.

i'm sure if i had cold air moving through the heatsinks (rather then the 21 C room temperature) I could reach 0.9V though, or at least achieve a stable 0.88v

[goxed]

Nice results, goxed.  What voltage are your boards at (once they're heated)?

The boards with good chips are at 0.9V, the ones with >=2 bad chips are at 0.95V

impressive. I cant get past 0.88v (39-41GH per board) without having chips or boards drop to 0 hashrate or produce massive3 error rates time to time

are you using heatsinks? especially on the regulator and the lower half of the board? I have put up a reference picture in this thread. if you copy that you should get the board up to 0.9v provided there's good airflow.

I have good heatsinks but perhaps could use slightly larger ones on the regulator/inductor. 0.865-0.87 is good for 40GH on my boards, but the pencil mod ramps up to maximum (or minimum?) resistance over a few days and its difficult to get the exact balance. once it climbs to >0.88v the boards become unstable and i see high error rates followed by entire boards or just some of the chips dropping to 0 every few hours and upkeep is a PITA.

i'm sure if i had cold air moving through the heatsinks (rather then the 21 C room temperature) I could reach 0.9V though, or at least achieve a stable 0.88v

If you have 40GH/s stable I think you are at the limit already. Kudos!

[klondike_bar]

Nice results, goxed.  What voltage are your boards at (once they're heated)?

The boards with good chips are at 0.9V, the ones with >=2 bad chips are at 0.95V

impressive. I cant get past 0.88v (39-41GH per board) without having chips or boards drop to 0 hashrate or produce massive3 error rates time to time

are you using heatsinks? especially on the regulator and the lower half of the board? I have put up a reference picture in this thread. if you copy that you should get the board up to 0.9v provided there's good airflow.

I have good heatsinks but perhaps could use slightly larger ones on the regulator/inductor. 0.865-0.87 is good for 40GH on my boards, but the pencil mod ramps up to maximum (or minimum?) resistance over a few days and its difficult to get the exact balance. once it climbs to >0.88v the boards become unstable and i see high error rates followed by entire boards or just some of the chips dropping to 0 every few hours and upkeep is a PITA.

i'm sure if i had cold air moving through the heatsinks (rather then the 21 C room temperature) I could reach 0.9V though, or at least achieve a stable 0.88v

If you have 40GH/s stable I think you are at the limit already. Kudos!

thats what i figured. Right now its running around 0.86-0.65v and producing 76-79GH fairly stable

[Xian01]

Happy Halloween

 

[Kaega]

"We're sorry, your hardware is being used to sell to fools on cex.io"

[-Redacted-]

You are aware that ghash.io has nothing whatsoever to do with Dave's operation, right?  That is not the 100 TH mine.  I don't know where people get that idea from, but it's untrue.

[superduh]

wonder what the future holds

[tom99]

Nice results, goxed.  What voltage are your boards at (once they're heated)?

The boards with good chips are at 0.9V, the ones with >=2 bad chips are at 0.95V

impressive. I cant get past 0.88v (39-41GH per board) without having chips or boards drop to 0 hashrate or produce massive3 error rates time to time

are you using heatsinks? especially on the regulator and the lower half of the board? I have put up a reference picture in this thread. if you copy that you should get the board up to 0.9v provided there's good airflow.

I have good heatsinks but perhaps could use slightly larger ones on the regulator/inductor. 0.865-0.87 is good for 40GH on my boards, but the pencil mod ramps up to maximum (or minimum?) resistance over a few days and its difficult to get the exact balance. once it climbs to >0.88v the boards become unstable and i see high error rates followed by entire boards or just some of the chips dropping to 0 every few hours and upkeep is a PITA.

i'm sure if i had cold air moving through the heatsinks (rather then the 21 C room temperature) I could reach 0.9V though, or at least achieve a stable 0.88v

If you have 40GH/s stable I think you are at the limit already. Kudos!

  you can do more than 40Gh/s with by disable few chips or disable dead chips for OC.

[bkpduke]

Anyone had problems with a V1 M-board?

I have one board that the last two slots just will not work.  Started within the last two weeks.  Initially I thought that the H-boards had died in there, but after swapping around a bunch of H-boards, the last two placed in the M-board fail to be seen, no matter if they work in another slot.

[klondike_bar]

  you can do more than 40Gh/s with by disable few chips or disable dead chips for OC.

what? Are you implying that disabling chips will make the board faster?

[Cablez]

  you can do more than 40Gh/s with by disable few chips or disable dead chips for OC.

what? Are you implying that disabling chips will make the board faster?

I think he is implying that by disabling weak chips you have more voltage for the strong performing chips and could clock them even higher which may get you over 40GH/s.

[dben428]

One of my October (v1.2) H-boards died on me. 

Just a reminder: make sure you have a backup SD card ready to go. In power cycling to test the H-board, I managed to screw up the originally SD card that came with the starter kit to the point that the OS couldn't properly boot even on a fresh, new image. Having a backup will save you from some future headaches.

[GandalfG]

  you can do more than 40Gh/s with by disable few chips or disable dead chips for OC.

what? Are you implying that disabling chips will make the board faster?

I think he is implying that by disabling weak chips you have more voltage for the strong performing chips and could clock them even higher which may get you over 40GH/s.

Better than disabling dead chips are remove it and short appropriate jumpers. You save energy for rest chips and can overclock little more.
If you haven't  appropriate equipment for that, go to any laptop repair service.

https://www.dropbox.com/s/xwl9p8pv1p0guh8/20131026_121407.jpg

[goxed]

  you can do more than 40Gh/s with by disable few chips or disable dead chips for OC.

what? Are you implying that disabling chips will make the board faster?

I think he is implying that by disabling weak chips you have more voltage for the strong performing chips and could clock them even higher which may get you over 40GH/s.

Better than disabling dead chips are remove it and short appropriate jumpers. You save energy for rest chips and can overclock little more.
If you haven't  appropriate equipment for that, go to any laptop repair service.

https://www.dropbox.com/s/xwl9p8pv1p0guh8/20131026_121407.jpg

Clean job there

[-Redacted-]

  you can do more than 40Gh/s with by disable few chips or disable dead chips for OC.

what? Are you implying that disabling chips will make the board faster?

I think he is implying that by disabling weak chips you have more voltage for the strong performing chips and could clock them even higher which may get you over 40GH/s.

Better than disabling dead chips are remove it and short appropriate jumpers. You save energy for rest chips and can overclock little more.
If you haven't  appropriate equipment for that, go to any laptop repair service.

https://www.dropbox.com/s/xwl9p8pv1p0guh8/20131026_121407.jpg

Very nice- looks like a pro job!  Much better job than the person that used a power grinder to sand the chip (and the solder mask, traces,  and surface layers) off the board.  With the chip gone, that missing bypass cap at C4E1 doesn't matter, either...

[GandalfG]

that missing bypass cap at C4E1 doesn't matter, either...

To much air pressure, and capacitor flying somewhere ...  
After remove all week/bad chip from my board I get average 2.4Gh   I use own, self build M_Board.

Code:

speed:3356 noncerate[GH/s]:148.362 (2.432/chip) hashrate[GH/s]:152.034 good:10363 errors:284 spi-errors:0 miso-errors:0 jobs:286 (record[GH/s]:150.710)
0:	880	39.113	38.759	2732	33	0	0
1:	880	38.053	39.562	2658	51	0	0
2:	881	38.096	39.139	2661	112	0	0
3:	715	33.100	34.573	2312	88	0	0

Tomorrow solder all bad chip on dedicated PCB and try resurrect it