Topic: Cairnsmore1 - Quad XC6SLX150 Board - page 28. (Read 286370 times)

I'm in the process of testing a new bitstream which should improve matters a lot. Stay tuned!

When I switch over between using different bitstream, I've got better results now doing a pre-emptive erase.
I did this the first time, when I started using hashvoodoo bitstream.
https://bitcointalksearch.org/topic/m.1110647

Same principle might help others moving between other bitstreams, if you've been flash over and over different ones a lot.

hm,

boards running the 190 MH/s bitstream should have a U: around 5.00-5.30

From your images it is clear that a couple of your FPGAs are not working well, U: less than 3.

I'd try with dcmwd2 150-160 MH/s to see what happens.

spiccioli

sn#62-0017
dcmwd4c_200 @ fpga0, fpga1, fpga2
dcmwd2_190 @ fpga3
2012-08-16 .. 2012-08-19:





because of the drop in the graph at 20120818 12:00 and all fpgas having orange LEDs for some seconds over and over again, I repowered the board and restarted cgminer, which helped a little bit...


---
As I marked in the graph, I then reverted to dcmwd4c_200 ... this still has the highest hash rates on my board, though the average is still not near 800MHash/s. no cgminer output for this because it didn't differ much from my past tests using dcmwd4c_200@all.
---
Now I'm trying this:
dcmwd4c_200 @ fpga0, fpga1, fpga3
dcmwd2_190 @ fpga2




I'm asking myself if I should accept these results because of development nature of the board, or if I should re-request RMA for the board at the coming weekend. What do you think? Any hints for improving results, besides of "try every possible bitstream combination of dcmwd2 & dcmwd4c"?

There's probably a fair few sources of suitable ready-made cables out there because they're used (for instance) to connect Atmel AVR programmers to development boards and those are insanely popular with electronics hobbyists. At least, it looks like a 2x5 pin 2.54mm/0.1inch pitch IDC connector to me.

The model I'm using has that difficulty reached by June 2013.

And ~14 million by January 2014.

Sure would be nice if I'm too pessimistic there, but I rather doubt that.

My payoff calcs results:

constants used:
Electricity here is A$0.21 per kwh
Bitcoin price: $10/BTC
Block reward: 25 (i realise we still have a few months to go)

Days till block reward quartering (to 12.5): ~1590
Max Difficulty for payoff within 1590 Days: ~6,000,000

Thank you.

We are still basically processing in order but we are ahead currently. What we are doing now is really to check that we have the right amount of Spartan-6 silicon. As we are getting towards the end of the pre-orders it is a bit like how airlines fill seats. They overbook seats on the basis some peipole won't show for the flight. We underbuy silicon on the basis some orders will drop out. So to avoid customer dissappointment we need to check now if we have enough silicon. The lead times to get extra Spartan-6 silicon are about 6 weeks ands we are already marginal on timing to get that in and build boards in September. This does mean we could be late on the last 100 boards or so if people tell us last minute they do want their order and everyone wants their entire order. Whilst we can carry a small risk of potentially overbuying a small amount of Spartan-6 100 boards worth would be a serious cashflow issue at best and it could be a lot worse for our business.

So before the end of the week we will decide on how much Spartan-6 silicon we need to buy and place orders accordingly. If we don't get responses from customers on the email that went out then we will assume they are not going ahead. We won't wipe their order but if they come back late then their order might be late as we will give priority to the people who actually responded.

We will be asking more people this week for payment. Our production numbers are only about 20-50% of a normal month currently so bigger orders like ebereon's can take most of a weeks production in one hit. The next 2 weeks are likely to be worse as there is a big public holiday here on Monday and many people take holidays that week or even the next one. We are very down on staff numbers over those 2 weeks.

Oh well, I was wrong! I checked it again and it seems they have the same dimensions, sorry about that! It could work if you cut the connectors, but make sure you connect it correctly, I don't know if it can damage the board when you connect it in the wrong direction.

eb

Thank you, ebereon.

I've got other connectors/ribbons left over from USB to motherboard and SPDIF to motherboard, but my recollection is that those all had the same pin spacing as IDE/floppy connectors.

Probably worth my while to just throw a few dollars at Enterpoint and avoid any parts procurement hassles for this since I only need one atm.

--

Guess all my junk box stuff is getting really old. Anyone need SCSI cables/terminators?

I got the email to confirm and responded with a yes. Haven't heard back with how to make payment (not via BTC for me - I'm BTC poor) and firm shipping date(s) yet.

Can you provide any update on how 'the second half of September' orders are being processed, please?

gah, sorry 

 

What's the actual mh/s you're seeing from the 200mh bitstream? I'm avg'ing ~770 per board.

Update on latest bitstreams:
Total 40 FPGA's = 10 boards SN#400+.

Makomk's wd4c oc bitstreams 2 day's running:
15x 210Mh, 25x 200Mh. That means 100% of all fpga's running @200Mh+ with <0.8% invalids!

Working bitstreams in percent:
210Mh oc = 37,5%
200Mh oc = 100%
190Mh oc = 100%
180Mh oc = 100%
170Mh = 100%


Update Glasswalker's bitstream:
175Mh oc = 100% (only short test about 2 hours)

eb

Update Power Consumption:

10 x CM1 (mix of makomk's wd4c 200/210Mh bitstreams)
1 x PDB
1 x LogiLink 10 Port USBHub (12,95€)
1 x ASUS Netbook (Win7 32bit, 1GB, cgminer 2.7.0a)
1 x PSU Super-Flower SF650P14XE Golden Green Pro 80plus gold - 54 Ampere max. on 12V (79,95€)
-----------
424W @ 224V @ 8.1GH/s
Power Factor 0.98

eb

 

Nice ribbon cable and much more cleaner    your detergent is way better than ep's 

And nice shop added to my bookmarks.

Thank you.

You first problem is the connector size is all wrong. The length may also affect results as well. Also IDE ribbons use a strange double wire setup which tends not work in anything else.

It's possible to make these things and that is probably better but unless you have the right kit results can be patchy. There many hairless engineers around as the result of trying to make up ribbon cables.