Interesting Card based on that 600mh/card estimate that puts it mighty close to a 6990

They have 61 cards left in stock.

How much power required if put 3 of this cards

silverstone st1500 required for 4 x 6870x2 card? 1500w

Not quite as easy to find 5830s anymore unfortunately, although the Mh/$ ratio for the ones that recently sold brand new for $130 easily passed 2 Mh/$ making them very desirable cards. I bought two when Newegg had them for $130 and I can get each one to run ~330 Mh/s completely stable with added voltage, ~324 at stock.

To get the same hash rate to price ratio out of the AX6870X2, you'd have to buy one for under $300! While the 5830s are about the best in terms of Mh/$, there is also something to be said for the AX6870X2's higher hash rate per card. At some point, performance per slot becomes more and more important.

Truth. I'm anxiously awaiting the release of the 7000 series having heard many enticing rumors (smaller mfg tech, lower power consumption etc.) which indicate that we may be getting some cards out of the 7xxx bunch that exceed expectations and come out as some of the best mining cards available. Then again, I've also heard that some of the initial releases will merely be re-branded 6xxx GPUs, so only time will tell. Hopefully the 7xxx series will bring at least some type of card which contributes positively to our collective cause.

Anyone have an appx TDP on this bad boy outside of "requires 600W PSU"?

Guessing ~300W max?

I can't find specifics for this card, but I think that holds pretty much true at stock voltages.

A single-gpu 6870 has a TDP of ~150W, so logically this dual-gpu would TDP at ~300W.

In reality, it's probably slightly less than that due to sharing the same PCB. However, you'd easily make up for that in overclocks, which would pretty much be a requirement on these cards.

I'd give yourself room for at least 350W / card, perhaps 375W if you plan to ramp up the voltage.

For 4 of these, you'd need at least 1500W at that top end, not accounting for the rest of the system (~70-90W on average), and this would put you near or past the maximum for that silverstone 1500W PSU linked above.

I'd recommend a dual-PSU setup with a pair of >=800W units.

That makes the total cost for such a system..  $_$

Well, of course a 2400w PSU is laughable. There's no such thing, they do not exist yet. As I said in my post, to run four of those cards, you'd want 4 x 600w (MFG recommendation) to have plenty of cushion room for overvolting, stability, and all of the other parts of the mining rig that are drawing power. When you add it all up, a mining rig with four 6870X2 dual-GPU cards is definitely going to require a group of power supplies in the neighborhood of 2400w.

There's absolutely no way those cards require 600W.

If they do, you might as well just forget about them entirely, with that kind of power draw you're going to be spending more in electricty than you'll make in bitcoins.

I stand by my 375W maximum per card estimate.  Someone can drop the cash and feel free to prove me wrong

Either 4x 450W PSUs or 2 >800W PSUs, but 2400W is crazy talk.  You want padding, not a padded room.