Topic: Swedish ASIC miner company kncminer.com - page 1262. (Read 3049528 times)

Quote from: soy on October 20, 2013, 05:04:24 PM

Thanks. Then it may be the voltage in filtering. Building a buck converter to drop voltage from 16.5 to 12 for a zTex, the requirements were a low ESR cap very near the input leads of the buck converter. So, the 12v in rail has low ESR capacitors that remain in place even tho the VRM are turned off.

I was wondering about that since the caps, etc around the removed VRMs are also removed from the 4 VRM boards.

I'm not so sure that's the case. Looking at my one module I see what I think is an empty VRM spot near the "1" and there is a row of caps there.

I have the one miner that has both boards in it for comparison Wink

Okay, whether the KnC caps are there or not, the VRMs have internal caps on the 12v rail, and some of those are assuredly low ESR, and those are not there when the VRM is not installed so adding low ESR caps to the 12v rail should improve it.

Using 0.95 or 0.96 will save me more than $5.50 per month only if I get the same hashrate and WU.

I'm not going to add the caps now as after a 7+mile jog and that it's late afternoon and that I'm getting on in years, I'm more likely to make a mistake. Maybe tomorrow after lunch before a run.

soy

legendary

Activity: 1428

Merit: 1013

Quote from: DPoS on October 20, 2013, 05:00:21 PM

Quote from: DPoS on October 20, 2013, 05:00:21 PM

Thanks. Then it may be the voltage in filtering. Building a buck converter to drop voltage from 16.5 to 12 for a zTex, the requirements were a low ESR cap very near the input leads of the buck converter. So, the 12v in rail has low ESR capacitors that remain in place even tho the VRM are turned off.

I was wondering about that since the caps, etc around the removed VRMs are also removed from the 4 VRM boards.

I'm not so sure that's the case. Looking at my one module I see what I think is an empty VRM spot near the "1" and there is a row of caps there.

I have the one miner that has both boards in it for comparison Wink

Okay, whether the KnC caps are there or not, the VRMs have internal caps on the 12v rail, and some of those are assuredly low ESR, and those are not there when the VRM is not installed so adding low ESR caps to the 12v rail should improve it.

Using 0.95 or 0.96 will save me more than $5.50 per month only if I get the same hashrate and WU.

soy

legendary

Activity: 1428

Merit: 1013

Thanks. Then it may be the voltage in filtering. Building a buck converter to drop voltage from 16.5 to 12 for a zTex, the requirements were a low ESR cap very near the input leads of the buck converter. So, the 12v in rail has low ESR capacitors that remain in place even tho the VRM are turned off.

I was wondering about that since the caps, etc around the removed VRMs are also removed from the 4 VRM boards.

I'm not so sure that's the case. Looking at my one module I see what I think is an empty VRM spot near the "1" and there is a row of caps there.

I have the one miner that has both boards in it for comparison Wink

Okay, whether the KnC caps are there or not, the VRMs have internal caps on the 12v rail, and some of those are assuredly low ESR, and those are not there when the VRM is not installed so adding low ESR caps to the 12v rail should improve it.

DPoS

sr. member

Activity: 462

Merit: 250

Thanks. Then it may be the voltage in filtering. Building a buck converter to drop voltage from 16.5 to 12 for a zTex, the requirements were a low ESR cap very near the input leads of the buck converter. So, the 12v in rail has low ESR capacitors that remain in place even tho the VRM are turned off.

I was wondering about that since the caps, etc around the removed VRMs are also removed from the 4 VRM boards.

I'm not so sure that's the case. Looking at my one module I see what I think is an empty VRM spot near the "1" and there is a row of caps there.

I have the one miner that has both boards in it for comparison Wink

eurgbp2011

member

Activity: 101

Merit: 10

Jupiter weighs exactly 10 kg.
Dimensions fit exactly or even too tight for hand baggage limits of ryanair if you bubble wrap it three times.
So be aware of your luggage limits... and ryanair...
and damn stockholmish prices for taxi (15 kms are 60 EUROS) ...
Bus from skavsta airport to city terminal will cost you 16 GBP.
It is faster to walk to knc office from terminal, took me 15 mins tops, 1.2 km walk with GPS navigator.

and damn bloody cold out there -1 to +4

I appreciate London's weather after that =)
Was a nasty surprise! Shocked

And a huge mental and physical stress for entire day and night.
Almost certain that one or more fan covers will fall off or be loose, you must check insides before switching on your gadget!

soy

legendary

Activity: 1428

Merit: 1013

Quote from: ur0pl on October 20, 2013, 03:31:10 PM

Thanks. Then it may be the voltage in filtering. Building a buck converter to drop voltage from 16.5 to 12 for a zTex, the requirements were a low ESR cap very near the input leads of the buck converter. So, the 12v in rail has low ESR capacitors that remain in place even tho the VRM are turned off.

I was wondering about that since the caps, etc around the removed VRMs are also removed from the 4 VRM boards.

I'm not so sure that's the case. Looking at my one module I see what I think is an empty VRM spot near the "1" and there is a row of caps there.

KnC 0: | 149.8G/138.1Gh/s | A:499611 R:33063 HW:39437 WU:2197.4/m

The above line is the best I've had yet and Slush is showing the miner doing 137.2GH/s. I'm hesitant about shutting down a well working machine to add tantalum caps to the 12 rail on the module. If it improves and I can use as a result 0.95 or 0.96 and drop over 100 watts at the wall, I still won't get any higher hash or WU than I'm getting right now. Let's see, what's 100 watts costing me per month, (100watts)(24hours)=2.4KWhours/day. 30.5 days a month that's 73.2kw/month. $0.075/kw * 73.2 = $5.49.

ur0pl

newbie

Activity: 56

Merit: 0

okay that seems to have worked and fixed it

Okay nothing work, so now i tried to do what someone else said with downgrade to .90, power cycle, run enable cores, power cycle, upgrade to fw. .96. So far I went through one cycle of many enable cores back from disable and then some going to disable again. SO, maybe it works now. I really hope this fixes it.

Also, i tried connecting only one hashboard at a time, and i got the same error of hashing going to 2 Mb/s after an enable core disable core cycle.

I hope this new try works.

Okay. that seems to have worked and fixed it. However, someone told me that I could hit "d" then "z" in cgminer to 0 out the statistics. So this is a cgminer error problem because even though I would get 1.8 Mb/s average, I would still get 500+ gh/s 5s hash rate

DPoS

sr. member

Activity: 462

Merit: 250