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Hello Everyone,

This is the rig I am building, I have 3 280x's right now and a 4th on the way. I plan on going to 5 or six possibly with 2 PSU's but that's another topic.

GIGABYTE GA-990FXA-UD3 motherboard
AMD Sempron 145 Processor (SDX145HBGMBOX)
Corsair AX1200i- Platinum Rated PSU
8GB RAM
Running on Ubuntu 13.10 (Linux)
Non-powered risers


Now... I have not undervolted any of the GPU's yet so they are all currently sitting at the stock 1.2V

I was wondering if I would be able to run a 4th card on that same AX1200i without undervolting the cards... and how safe that would be because I know it would have to be close to max load. I have ordered a watt meter so I can see exactly how many watts im pulling at the wall but that is not here yet either. any help would but greatly appreciated and I will also provide discounts or extra time on renting my rig when we its done at https://www.betarigs.com/rig/3841 if you want haha


I will need help in the future on how to undervolt these suckers too so I will be open to any help possible.

Thanks in advance for any and all responses!
-DrCharles

You could but you'll be pushing the limit.  Some of these PSUs can push a little more than spec'd but the efficiency just gets shot.

Better off getting say, two 850w and using a splitter.  That way you'll have lots of headroom and a much lower hydro bill.

I have if you want  ;D ;D ;D
1200 W Gold
Really I am selling my PSU and GPU if you are interested PM

http://www.newegg.com/Product/Product.aspx?Item=N82E16817256054

I've got ~12 of these units running with np for months now.

Absolutely no need to run 2 PSU for 4 280x though.

for the best you should have for one card one PSU.(650W)

You should be ok with that Corsair AX1200i. Each card use about 250 watts, unless you have it super OC'ed. If OC'ed, then a 1400 to 1500 watts PSU would be needed or a secound PSU to cover the overhead.

http://www.coolermaster.com/powersupply/silent-pro-m2/silent-pro-m2-620w/

Go for Lepa 1600 for your 4 R9 280X

Thanks for the replies. I have my 4th card now as well as some gridseed asics that I am itching to hook up but I do not have the watt meter yet so your responses have helped. I may just get the second PSU to be sure, I do not want to overload or keep the Corsair at max load. This is really the first rig I have been building myself but I have been lurking on [Suspicious link removed]ince probably late 2010 or early 2011 and this is the first time ive posted haha

Does anyone have a rig similar... 4 Gigabyte R9 280X Rev2 GPU's on a single power AX1200i PSU that is working and they can post a picture of or some stats? I would like to see what some of my fellow GPU miners are using.

Thanks again,

-DrCharles

i have almost the same hardware. but i bot 4 PSU for each card (650w)