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What is the best PSU one should get?
What brand I mean? Cost?

Thank you

depends on what you want to run

Should probably look more at important things like...
Max wattage
Efficiency rating
Number of rails
Amperage of each rail

More important than brand names and prices. Asking best brand and price is gonna get you 50 different opinions from 50 different people :P

Seasonic's X series is good.

The best of the best, you can't go wrong with Seasonic X

I sow some pepole running 5 cards...
What psu they using
?

One that doesn't explode, cheap ones are bad: http://www.overclock.net/power-supplies/183810-faq-recommended-power-supplies.html

Probably more than one.
For 2X5870 X-Series 650W should be enough. For 2X5970, 850W.

I used Corsair TX650w with 2X5870  ;)
Now, with 2X5870 +1*5850, I use XFX Black Edition 850W  8)

I have some of these on the way http://www.newegg.com/Product/Product.aspx?Item=N82E16817139014

I would actually look more at the continuous wattage, max wattage isn't sustainable in most cases and the number of rails doesn't matter...

THIS.

Can a PSU straddle more than one machine?  Say you have two boxes with 4 cards each.  Could you stick a 600-700 on each mobo and then set up a third PSU to feed some of the cards off of each mobo?

Yep, that's possible.
There's actually supplemental PSU's they sell made just to juice graphics cards and processors.
Some even fit in a 5.25" drive bay.

Efficiency wise I would recommend

1. Seasonic X (80+gold)
2. Corsair A (80+gold
3. Silverstone Strider + (80+ silver or gold)

Though they do come at a price premium, but I use those for most of my work units.

I don't mind running a few crappy miners either since they cost next to nothing. Using basic 300W Fortron/FSP psu's they run 24/7 just fine since last Sept.,, although incur higher electricity costs and are less efficient.

And they are practically limited to 5850s and 5770s so no efficient dual gpu setups possible.

for 4 6990s would which psu would you recommend?

I recommend an Antec 1200 High Current Pro, I have used one and ran 1800W (measured wall draw) continuously for weeks with no problems. I have also seen where the rating has been exceeded for up to 2100Watts and the PSU still held together!

how about a motherboard to support 4 6990s with an external water cooling system?

http://www.tomshardware.com/reviews/750-watt-psu-80-plus-gold,2927.html


FSP AU-700 is what I'd buy after reading that review.

The asus Rampage III Extreme, Maximus III Extreme, and Croshair 4 extreme are all very reliable and comparable. they were designed for 4 GPU solutions and dont need any PCIe cables or converters.

For an external cooling system that will scale with larger systems and multiple systems Koolance has some rackmount solutions
http://www.koolance.com/water-cooling/product_info.php?product_id=1173

Yea thats exactly what i tallied up.. couple of grand. ill keep you guys upto date with what i am doing, and i will offer some pictures and updates on daily changes. lets hope all this goes well before i burn down my place! lol

ps im trying to run 3 motherboards @ 4 6990s each. so im going to get me 3 different psu and 2 water cooling systems with multiple tubes. hoping the wiring in my building can hold and not short break on me.

You should test barebone-systems with all those high-load cards first before you go all high-investment into watercooling and other fancy things just to make sure your apartments can support it without blowing fuses, if you're worried about that.

I'd hate to see you spend all that money and time setting up waterblocks, tubing, getting it all nice and neat into the case, wire management, etc and having something not work right.

With all that said, do post pics of the final setup =)

You sir are a true american hero.

not for four 6990s you wouldn't, or at least I hope you wouldn't...lol

Sorry you're right, I wasn't paying attention to exactly what he was trying to run; I was on auto-pilot posting that after reading so many threads where people were asking what PSU to buy for their dedicated miners with 1-3 GPU's in each box.  That link also has interesting graphs of efficiency vs load which will tell you how much to overshoot your power requirements by when picking a PSU.

Corsair AX series is excellent. AX1200 is the top model I think

I have had good experiences with OCZ...

I have FSP Aurum in 2x5870 rig and Enermax Modu87+ in 2x6970 rig. Enermax is best - very efficient, quiet, stable but high-priced.

Hi thread starter hope you don't mind me linking to this page since theres a lot of information and discussion going on :)