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Building a Mining Rig.

Tags:
  • Corsair
  • AMD
  • Build
  • Components
  • Power Consumption
  • Power Supplies
Last response: in Components
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February 5, 2014 3:02:39 PM

Greetings.

So I've decided to build a mining rig for some cryptocurrency profit.
If someone is familiar with this his help is more than appreciated.
I'll put down my parts that I'm planning to buy and I want to know if I'm making any mistake in the process.

AMD Sempron 145 2.8GHz Single-Core Processor

ASRock 980DE3/U3S3 ATX AM3+ Motherboard
Corsair 4GB (1 x 4GB) DDR3-1600 Memory
Asus Radeon R9 280X 3GB Video Card x2
Corsair RM 750W 80+ Gold Certified
Extender PCI-E 1x to 16x riser adapter,1X board& 3.0 USB

Planning on using a bootable USB stick sot HDD is not an issue.
I was wondering about the PSU choice a lot.Not sure if the 62.5A from the 12v rail is enough to cover my 2x280s. On Asus site points a 300w max consumption, on a previous article tested to consume 257w on actually mining process.
I've picked 300w just to be sure and translated into 25A for each card and bringing us to 50A from the 62.5A total of the 12v rail and assuming the rest parts can't be more than 12A
Does this PSU fits the rig or I should look to a 800W/850W one?

I really want to hear your opinions on all by above assumptions and thanks in advance!

More about : building mining rig

a b À AMD
a b ) Power supply
February 5, 2014 3:31:13 PM

Risers suck and give people many problems with mining rigs. Better off buying a MB that has 2 slots instead that are far enough away for heat.

AT current prices and difficulty for LTC, you are looking at 6+ months to pay off the hardware, depending on what your electricity are before you get any profit, and in 6 months if the difficulty goes up, less profit you will make.

Also, if ASIC chips get into scrypt mining, it's over for GPU mining like it was/is for BTC and your GPU's will be pointless. They are supposed to be coming out this fall, about the time you would break even on hardware. Risky venture. The 280x's are so expensive right now because of miners. In 6 months if you want out, and ASIC miners are out, your cards won't be worth much to resell and your system isn't gaming in any other way, so you couldn't even salvage the rest for a gaming rig.
February 6, 2014 8:54:25 AM

Greetings getochkn,

About the risers I think its the only to keep GPUs cool. At the moment my single 280x runs at 71C stable with a pinch of overclock.
And if I want a MB with more than 2 slots space between PCIE Slots I'll have to spend twice as much for it. Maybe it's worth it.

About the LTC part with that addition I'll be able to push out almost at 2.9MH/s which turns into a roughly 350euro per month after electricity bill.
And that is just for strictly mining LTC. At some times other coins are even 50% more profitable than LTC that you can switch to scoop some more bucks.After all you always hoping for LTC increase it's current price :) 

Thanks for your interest and I'll really consider buying a MB with more space between PCIE slots.
Related resources
a b À AMD
a b ) Power supply
February 6, 2014 2:13:47 PM

Up to you, but I don't know where you get that a 280x can do 1.5MH/s and getting 2.9 with both. 290x's can't even do that from what I've seen.
February 6, 2014 4:28:49 PM

getochkn said:
Up to you, but I don't know where you get that a 280x can do 1.5MH/s and getting 2.9 with both. 290x's can't even do that from what I've seen.


Well yea you can't pull 1.5MH/s per 280x.
I'm actually pulling 720KH/s on 70C. My thought process was getting two more and another one after so having four in total.

!