https://bitcointalk.org/index.php?topic=427347.msg4666835#msg4666835

The Corsair units are overpriced.  You pay extra for the name.  LEPA (Enermax brand) and XFX CoreEd (Seasonic oem) are units with very comparable build quality.

OP, i would suggest you put all 4 of those PSUs listed on auto-notify and grab the next one that pops up.

For my 4 xfx reference blower model 290s with 100% uptime since rig inception in sgminer:

Dustcoin was left 'in the dust' a while ago... it's not very useful anymore.  Coinchoose is a better alternative.

I had this same exact problem with my 290s, and it turned out that cgwatcher was the culprit. 

I found this out by running the miner directly from a batch file and all 4 cards spooled up fine.  Turned on the miner through cgwatcher, no dice.  So i deleted the profile, made a new one.. same problem.  So i put in a fresh cgwatcher folder, and the darn things ran.

I will also recommend you manually save your cgwatcher profiles into a text file.  Don't bother porting the profiles.dat file out, that was one of the issues.

280x's get to 300w in a hurry.  

CX430 = $40.
280x = $400.

Not worth the risk if you blow something up.

You need x1-x16 powered risers like these.  4/5 290s inside the board all scrunched up is a very bad idea.

Mainboard: MSI Z87-G45  
 >>> About as good as you are will get for slot quantity and arrangement / affordability for the LGA1150 stuff.  You could do 2 up, 3 down for maximum spacing / airflow.  So, 3 powered risers linked up top.

PSU: 2 x Seasonic Platinum 1000w
 >>> My 4 290 rig pulls 1320w from the wall with each card @ stock volts + 965/1475.  You can easily figure each 290 for minimum 300w at stock clocks.  In other words, your typical 1500/1600w unit will be maxed out by the cards alone..  You will need a little device like this to get both power supplies working at the same time.

Ignore the mining boards from Asrock / Biostar until they come down in price.  They are novelties until supply meets demand.  

Strongly disagree:
#1 Demand for those 1st-3rd gen scrypt asics will be astronomical.  Outside of personal company use, group-buyins, and solo farms buying up thousands of units, the chances of your average miner (you, me etc)  getting units is extremely small.   One could very well hold out for the next 2 years before scrypt asic supply levels out the demand.  Certainly not worth losing out on current profitability by "holding out".

#2 GPUs will (usually) be viable for next generational algorithms, while asics (probably) wont be.  Never buy non-repurposable hardware for the sake of end-game returns.  Look at the btc asics.  Only the very best asics are still viable, everything else is virtually worthless.  GPUs retain innate value and returns from their multipurposibility, while asics grow only to obsolescence and at a certain point, no return (or negative).  

#3 Going fiat to crypto is what is risky.  Cypto could crash tomorrow, and you lose your fiat.. period.  Going the hardware route is your hedge against risk.  Your hardware will not evaporate if crypto crashes.  Now, if one can't mine due to environmental factors or electrical, then fiat is your only option.

Interesting.  Colbert could have some serious fun with this.  

Could you imagine him harping on and on about how he is cryptorich?  












...HOWEVER

Get permission from Colbert in writing.  Do not just up and up make a coin based on him, his likeness, or his reputation.  Remember coinyeee.

Stay far away from Tt PSUs.  I have seen and experienced alot of trouble with them in the past.

All of these units are $250 and under:
XFX ProSeries 1250w  (Seasonic rebrand)  Out of Stock @ newegg (maybe fine elsewhere or set auto-notify)
LEPA G1200-MA (Enermax rebrand) Out of Stock @ newegg (maybe fine elsewhere or set auto-notify)
SilverStone Strider Gold SST-ST1200-G In stock
Rosewill LIGHTNING-1300 1300W  Out of Stock @ newegg (set auto-notify)

All good PSUs and up to the task.  4 7950s will come very close to 900-1kw and thus a 1000w unit is really on the red line.  Most 1200w units are only a couple bucks cheaper as it is.

The LEPA is best bang/buck followed by the Silverstone.  I am currently using 2 of the LEPAs and for 9 months now they have been going strong @ roughly 1kw load each.  

I have a Silverstone 1500w unit on 4 290s and it's been rock solid for the last week.  I would expect the 1200w unit to be of the same build quality.  

The Rosewill units are Newegg's house-brand so you won't find them anywhere else, but regardless they are worth mentioning as they have good user feedback / 3rd party reviews that reflect a solid build quality.

Noone will sell it that cheaply.  Miners aren't even close to making back their electricity selling that low.

I am seeing the coin worth ~.01 - .015 btc per 1k.

Stick with the 280x's.  It's not fun fighting the mainboard / AMD drivers getting 5-6 270s recognized and running.  

Also, use sgminer and try the Cat. 13.4 driver pack / 2.9 SDK combo first.

#1.  Get your money back from Alpha Technologies now.  They are the first BFL of the scrypt asic mining scene.  People are handing them thousands of dollars for pre-order vaporware.  Companies that fund their dev with pre-order cash = you may/will not (ever) get your hardware in time to make ROI.  Ignore the Scrypt asic hoopla for it - it's virtually all hype and very little substance at the current moment.

#2.  Scrypt Asics will not purely outhash GPUs (yet).  They will certainly do better hash/watt/density, yes, but asics are not repurposable for supporting future algorithms at the hardware level. They are therefore a terrible long-term bet if/when the need may arise to sell back hardware.  I could sell back my paid-off hardware and offset the electrical bill difference easily.  See those AMD cards selling for hundreds above MSRP? Yeah.

#3.  4 280x's is apx 2.8/3mhs.  That should net you at least half a btc a month on middlecoin (and much more on "good" days).  You are only gonna spend a small portion of that on electricity.  It's a good investment.  Go for it.

Folks, please don't get scammed by thieves hawking fakeware like this.

Got 2.5k FOX up for .045 btc.

PM me

Pending sale of 2.7k @ .035 btc to forum member sitefive.

wow, good find. 50 coins already?  Bluffing or actually has.

I know people with double digit mhs who don't have near that.

I've got nearly 10mhs and only 2 coins and i was in from the beginning.

Peers:
107.22.238.207
174.51.17.18:14333
67.161.249.69:14333
89.231.122.140:14333
98.203.21.162:14333
14.223.0.104:9333
135.23.109.42:9333
[2001:0:9d38:90d7:42e:3f16:8ae0:c690]:14333
86.83.153.61:57077
62.234.75.6:14333

85.25.197.186:3477

.. works.  Ty.

Doesn't work.

Need nodes.

2,000 Fox up for .25 btc, pm me.  Negotiable.

- Edit: No buyers?  Cmon, where's the risktakers!

Undervolting as mentioned above is a must.

280x's get near 300w in a hurry @ stock volts of 1.2v.  The 7970 GHZ Ed @ 1.256v was a bonafied 300w card.

To accomplish putting 4 of those 280x's on that 1200w unit, you would most likely need to get volts down to 1.1 or under.