Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Hi folks! What PSU should I buy in order to make this work?
Document: I have two of these units -- running non-stop since January 2014 without a single problem (and they are overclocked at about 190Gh/s each). They work really well if you have a proper power supply and can keep the room somewhat cool. In January 2014 I paid over $2k each.As of 6/2014: it looks like you can now buy these for under $300.
This is assuming you don't have to pay for electricity.BUT -- don't buy these to make money, as you probably won't make much and you could potentially lose $10 or $20.Buy one of these to participate in the Bitcoin phenomenon. It is fun to mine and they don't require a computer (after you initially set them up). At $300 each -- your risk is very small.I've yet to see anything better at this price and efficiency.
So I recently became the proud owner of an Antminer S1 from Bitmain. My only regret is that I wasn't able to buy nine more. Whether you are just starting to think about getting into Bitcoin mining and want to purchase your first rig or you're a seasoned old-timer just looking to upgrade your hashrate, this unit is for you. As of today, four days since plugging it in, I've mined a total of just under 0.06 BTC (just under $40).
They also have direct 12v power connections (haven't used this tho), and can connect the frames together with the pre-drilled holes if you want. They also work well even in a hot environment. I live in the San Fernando Valley and my garage gets to close to 100 degrees on some days, but they haven't had any problems so far.
I&#8217;m earning 0.1 BTC every 3 &#8211; 5 days&#8230;Seriously considering upping my PSU wattage (to 900 watts) and getting a second miner..
I like these miners and would recommend them to anyone that wants to get a good jump start into the bitcoin game. With the constant rise of difficulty, it will take a while to make your initial investment back.. but it's a fun game to play, the bitcoin game. Here's hoping their value increases off the charts soon!Oh, I like that these have wifi too! I have two of these and both run on wifi just fine. I even added an antenna to one.
Jones Gear is the way to go for equipment. Everything I have order from them as been shipped in well protective materials.Our Ant Miner has been running for little over a week and is averaging 179GH/s  according to the Stats page built in the thing.It produces a ton of heat similar to the Block Erupters,  I would highly recommend adding an additional fan to help dissipate heat, although this is not required!!
I ordered 12 units on the same day. 6 were new and 6 used(this order....used were cheaper by $30 per unit). I expected to get the used items first with the assumption they would actually be stateside. (It turns out both sets were stateside but the new units arrived 3 days earlier. Of the 6 used units, 1 has a bad Ethernet port and exhibits symptoms indicating complete cont. board failure.
Works perfectly. No instructions, needed to do an internet search to work it out, but, overall, it came exactly as described.
Super quik delivery and product was only maufactured 3 months ago.Make sure power supply can deliver (20amps) to each blade or you will only be able to power one side.
Answer: I would buy at minimum at 550 gold rated psu.. If you plan on buying more that one  then get a 850 gold now and you will be ready for another ..   I use ocz 850 gold.   Works on 2 s1, 2 s3 or one C1 liquid cooled.