![]() ![]() Get this wrong and your hash rates will be horrible. You just have to give it 2 or 3 weeks to arrive. I do it all the time to save money and the quality is fine. Nothing sucks more that having your rig down for a week while you wait for a $9 cable to come in the mail! If you have the time, don’t hesitate to order this stuff from China on eBay. The shipping costs just as much as these adapters, so I decided I would make sure I had extras of everything. I was using a PSU from a Dell workstation that had no molex power connectors so I had to order some SATA to Molex power adapters too. You should also make sure your PSU has enough PCI-E power cables for your cards or some available Molex connectors that you can use with the power adapters that usually come with the video cards. You can jumper the 2nd PSU to keep it running all the time or get an adapter like I did. If you want 3, then you could do (1) 1200watt or (2) 700 PSUs and just split the load across the cards. I think that if your just running 2 cards, an 850 watt PSU should be perfect. I did run for a while at around 820, but then I added a third card and connected that to another 750, but forgot about the 75 watts being pulled from the board by that third card and Pow! no more PSU. Power Supplies - My first power supply was a 700 watt Thermaltake PSU ($39 after rebate), but I fried it because I wasn’t paying attention to the Watts being used on my Kill-A-Watt when I added a second card. I have not tried my new “USB 3.0” Riser yet, but I like the flexibility it offers. I started off with just one type of powered riser card and then found out I didn’t really need a powered riser unless I went above two video cards, so now I have a good mix of risers that I can change in and out as needed if I expand. Very hard to find any 7950s for under $400. The video cards are Sapphire Radeon 7950 Video cards that I got on for about $350 refurbished. ![]() Then to connect the bases together I just used a cheap wood lathe from my hardware store. I used plumbers pipe hanging straps that come in a roll at your local hardware store and some motherboard standoffs to hang the video cards from the wire shelving. My garage is really cold right now, so all I needed for cooling was an AC case fan that I got from Global Industrial for $39.95 I got a refurbished Corsair AX850 power supply from Fry’s for $108 (Now sold out). The fans on the back of the server were easy to flip around so that they would blow air over the CPU and memory in the open case. The server uses an Intel S5000PSL server motherboard, so drivers were easy to get from the Intel website and it’s running windows 7 Pro 圆4 just fine. It was a great candidate because the case was small and easy to mount to the wall in my garage by bolting it to some wire shelving I already had installed. I had a Rackable Solutions server from SGI that had dual Xeon CPUs, 16GB of memory and 4 PCI-E slots. I decided to think outside the box and try to use some retired servers from work (Free!). Note: The part images shown below are hyperlinked to examples on Amazon, ebay, etc.
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