I would like to build a mining rig with 3xHD7950 or equivalent GPU's with similar hashing power
(yes I know its not cost efficient for SHA256, but thats not the problem) .
1. Why does everybody have the an high end ASrock or MSI or GYGAbyte?
Shouldn't every motherboard that has a combination of three: pcie x1 (considering you can buy the x1 to x16 adaptors) and pcie x16 , be good enough? Like for example this one:
http://www.asus.com/Motherboards/P8H61MX_R20/#specifications .
Do miners have those Asrock so they can connect up to 6 gpu's?
2. So my little secret is to buy a refurbished Dell precision computer on ebay for moreless $200-300, and make sure it has a motherboard with those 3 pcie that I was talking about in (1.). Then buy a 800W PSU and add it up in parallel with the 400-600W PSU that comes with the original case and connect them both with: "
http://www.add2psu.com/ ". Then buy the risers to make sure I can put the cards out of the Case. I also would make sure that the total of 6-pin PCI Express power connectors would be equal to three.
Does that sound like a good idea?
Thanks.
PD: I think that that add2psu is really a great way to avoid to pay 400 dollars for psu, and instead just buying two mid-wattage PSU for a total of around $120
Umm you know you can buy a very good Motherboard, something that can run 4-5 GPUs, along with a CPU and RAM, for like $200 brand new? $100 for a decent MB, $40 for the cheapest CPU you can find, and $60 for 8GB RAM. Go ahead and price it out. A $7 milk crate, $10 flash drive, some riser cables, and some zip ties, and you've got a fully functional rig. If you did buy a Dell Precision for $300 and put 3 GPUs in there, you'd prolly have heat/ventilation issues anyways.
And you don't need a add2psu adapter to use multiple PSUs. A simple paper clip and some know-how, and you can run 2 or even 3 GPUs per rig. We just bought a whole ton of 750W PSUs, and plan on using 2 for each of our GPU rigs. Much cheaper than buying a single 1500W PSU, I'll agree with that!