use the calculator on coinwarz.com . It pretty good, but its in USD

solved,see post #1

Thanks Uncle!
I really had my head up my A$$ on this one. It was absolutely the power supply causing this issue. I have risers powered and unpowered but was not using them. I had the cards straight into the MOBO. At least until I could get the rig up and running at which time I would put them on risers. I had another P/S (another el cheapo) 450W that I used to power the second card directly and lo and behold. I had two cards hashing away. For about 15 minutes when the second powere supply puked and blew a capacitor. I doubt any of these cheap poer supplies can actually supply the amount of power they are rated for. I guess I’ll have to order me a seasonic or equivalent. I’m torn between trying to use one big ass P/S to power three cards or a medium one to do one card and the mobo and individual smaller ones for each GPU.

Any thoughts on that? I’ll look through the forums as well to see what I find.

[quote name=“dLight26” post=“54994” timestamp=“1390669591”]
GIGA R9-280x @ 1050MHz at 1.05v~1.075v w/710~720kh/s
4 GPU = 1050w AC on seasonic 1250w

It was 1400w AC at stock volt - 1.2v.
[/quote]

So almost the same numbers. I got one of those gigabyte 280x and I got best results with 1065MHz GPU clock.
I’m thinking about adding a 4th GPU to the rig powered by 1050W seasonic, should be enough, and it’s got 7 year warranty.

I bounced to coinotron and its worked out well.

Not sure what u need it for but this us quite a good tutorial.

[url=http://www.vogella.com/tutorials/JavaConcurrency/article.html]
http://www.vogella.com/tutorials/JavaConcurrency/article.html[/url]

I’m waiting for three 16x-16x risers to arrive in few days, so I think the best option is to try one of those in that middle 16x slot to see if it works.

If it’ll not work I’ll try to short it…but I need to find a guide on how to do it properly in the 16x slot (that thread shows the pic of a 1x slot shorted), to avoid some nasty problems :P

Btw, thank you again for your help, I’ll let you know as soon as the 16x-16x risers will arrive!

[quote name=“kaybo” post=“54489” timestamp=“1390521188”]
[quote author=ken link=topic=7023.msg54335#msg54335 date=1390490055]
I would do both if possible. It’s what I’m doing right now.

How much money are you looking to invest?

What computer would you be putting the card into? What PSU is in the computer?
[/quote]
I’m planning to invest another $200-300 on a graphics card. My current PSU is a 550W 80+ bronze with a HD 7870.
[/quote]

With $200 a Radeon 270 is a pretty good bet, with an expected khash of 425-450. Newegg has this ([url=http://www.newegg.com/Product/Product.aspx?Item=N82E16814150641]http://www.newegg.com/Product/Product.aspx?Item=N82E16814150641[/url]) 7850 for $169 with a $30 mail-in-rebate. I have 2 7850’s that I get almost 400khash from each.

With that power supply I would not get a 270X or another 7870. Either of those would put quite a draw on the PSU and you could risk instability.

There isn’t really a good card for the $300 range at the moment.

These looked promising…
http://www.thedebugstore.com/acatalog/SKU-076-02.html

until i saw the price, cheaper to build a 4 slot rig.

Ill definitely go down the flexible USB route though, id like to separate the cards a bit more to allow for pipework :)

its my main computer with a 7990

Here is the same question different thread.

http://forum.feathercoin.com/index.php/topic,6500.msg50246.html#msg50246

Hi, Nutnut. I was wondering if there is any possibility to see worker status using a json api or something like that so that I do not need always to log in to the server from my phone. If there is no such a posibility now would be nice to have one.

where abouts in the world are you? do you want to have a skype session to see if we can’t resolve at least some of your issues?

[quote name=“Kevlar” post=“54129” timestamp=“1390438912”]
Is it safe electrically? Emperically we’ve heard the answer is yes. But what about the science behind it?

Resistance is length X resistivity / Cross section area.

Dry wood’s resistivity is approximately 10^16 Ohms per meter, give or take an order of magnitude.

So for a given piece of plywood, assuming you had a vcc and a ground within 1 millimeter of each other and both pieces were touching the wood, you would experience a potential resistance of about 160,000,000,000 ohms over the surface of the wood. At +5vdc, you would experience a power draw, and therefore a voltage drop of less than 0.0000001%. (that’s well within tolerance, in case your wondering).

Is it a good idea for heat dispersion?

Well, the conductivity of structural softwood lumber at 12% moisture content is in the range of 0.7 to 1.0 BtuÃâ€"in/(hÃâ€"ft^2Ãâ€"oF) compared with 1,500 for aluminum, 310 for steel, 6 for concrete, 7 for glass, 5 for plaster, and 0.25 for mineral wool. If you want to get more specific, In Chapter 3 of the [url=http://www.fpl.fs.fed.us/documnts/fplgtr/fplgtr113/ch03.pdf]USDA Forest Products Lab Wood Handbook[/url], Table 3-11 entitled thermal conductivity of selected hardwoods and softwoods lists thermal properties for various species of wood. So in other words, no not really. Making a heat-sink out of wood would be a bad idea. But for just something to put your MB on, I’m sure it’ll be fine.

tl;dr: SCIENCE BITCHES!!!
[/quote]

Best. Answer. Ever :)

I have setup a few rigs which have been supported by wood until they reached their final destination and always had a little concern in the back of my mind. Guess I can feel safer now too.

[quote name=“vex” post=“54225” timestamp=“1390471406”]
[quote author=prensel link=topic=7107.msg54168#msg54168 date=1390460273]
There’s a list/spreadsheet where all modified bioses are listed.
[/quote]

the thread is lengthy… can you post a link to that sheet, if you know what page it is in…
[/quote]

Yes please, I’ve been through 20+ pages and yet to find it.

Hi,

I tested again make it works :)
But now I have a lot of HW. Or I have to set a very low intensity but my hashrate is below the one I can get with 2x5870 and 1x5770.
Any ideas ?

Thanks

Just got these mining yesterday. I’m getting 390 khash/s each @ --gpu-engine 1120 and stock memory speeds.

I saw one person with 412 khash/s with --gpu-engine 1200. I haven’t been brave enough to try that high on the gpu clock yet.

I’m very happy with the $/hash ratio @ 390 khash/s.