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Author Topic: Powercolor AX6870X2 @ Newegg for $450  (Read 6136 times)
st4rdust
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August 09, 2011, 01:08:56 AM
 #1

$20 off w/ promo code HARDOCPX8X3B, ends 8/9

Assuming you can push the cores above 300Mh/s, you're above 1.5 Mh/$ which isn't half bad considering you're in high-density territory with this type of card. I think I'll be going for one of these for my next rig.

http://www.newegg.com/Product/Product.aspx?Item=N82E16814131446

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August 09, 2011, 01:11:33 AM
 #2

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

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August 09, 2011, 01:20:51 AM
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Interesting Card based on that 600mh/card estimate that puts it mighty close to a 6990

Going by the Mining Hardware Comparison page, individual 6870 cards can make it all the way up to 330Mh/s. Now, I've never used neither the single card nor the AX6870X2 dual-GPU card so I can't say how they compare in terms of overvolting and core clock performance, but with some extra voltage, who knows how high up the dual-GPU card can go? I'd be very interested to hear from someone using one of these in a mining rig.

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CanaryInTheMine
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August 09, 2011, 01:46:04 AM
 #4

They have 61 cards left in stock.

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August 09, 2011, 02:01:08 AM
 #5

this card looks like it's in between having high density setups vs more mh/s per dollar. you can get around the same hashing speed with 2x 5830 for only around $250, although it would require more hardware space. this is not nearly as bad as the 6990 though.

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August 09, 2011, 02:58:34 AM
 #6

How much power required if put 3 of this cards
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August 09, 2011, 05:57:11 AM
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Interesting Card based on that 600mh/card estimate that puts it mighty close to a 6990

Tbh running 6990's below 800mhash is a waste of a good card.

6870x2 seems to have a better mhash/$ ratio though. You get less mhash per pci-e slot compared to 6990 but it's also heaps cheaper.
Yes it's $100 more than two separate 6870's but these chips overclock very well & you can fit 4 of them on a motherboard.

If you want to fit 8 normal 6870's on any board you'd need to buy a MSI BB Marshall which costs $400+ 8 extender cables.

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August 09, 2011, 07:10:35 AM
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silverstone st1500 required for 4 x 6870x2 card? 1500w
st4rdust
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August 09, 2011, 04:25:38 PM
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silverstone st1500 required for 4 x 6870x2 card? 1500w

Each one of these cards requires a minimum 600w PSU according to the mfg site's product page. Four of these cards, incidentally, would require much more than a 1500w PSU - at least 2400w, and you definitely want some room to be comfortable for the purposes of stability and overvolting, so four of these dual-gpu cards would require multiple PSUs.

Possibly two of your ST1500 units could handle four of these cards, but that's hard to say for sure without knowing what else the system consists of.

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st4rdust
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August 09, 2011, 04:29:57 PM
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this card looks like it's in between having high density setups vs more mh/s per dollar. you can get around the same hashing speed with 2x 5830 for only around $250, although it would require more hardware space. this is not nearly as bad as the 6990 though.

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.

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August 09, 2011, 05:16:13 PM
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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.
Pretty soon it's going to be very hard to find good deals but eventually 7xxx series will come out and hopefully drop the prices of 6xxx cards. If thats the case the 6870 will most likely take the 5830's place as the best card.
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August 09, 2011, 05:28:04 PM
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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.
Pretty soon it's going to be very hard to find good deals but eventually 7xxx series will come out and hopefully drop the prices of 6xxx cards. If thats the case the 6870 will most likely take the 5830's place as the best card.

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.

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August 09, 2011, 05:32:30 PM
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I waiting because the 6870 consumes less power then a 5850. If it drops around 20% in price it will be the best card by far.
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August 09, 2011, 05:54:16 PM
 #14

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

Guessing ~300W max?

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August 09, 2011, 06:45:16 PM
 #15

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

Each one of these cards requires a minimum 600w PSU according to the mfg site's product page. Four of these cards, incidentally, would require much more than a 1500w PSU - at least 2400w, and you definitely want some room to be comfortable for the purposes of stability and overvolting, so four of these dual-gpu cards would require multiple PSUs.
you gotta be kidding me. you go by manufacture recommendation? they ALWAYS overestimate. so far, i believe no graphics card goes over the 300w TPD limit (6990 exception), and they need to stay within this maximum because they won't be able to dissipate more heat in a double slot design (at reasonable noise levels).

getting a 2400w PSU for 4 of these just makes me laugh...

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August 09, 2011, 07:18:12 PM
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so far, i believe no graphics card goes over the 300w TPD limit (6990 exception)

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..  $_$




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August 09, 2011, 08:17:38 PM
 #17

Finally a cheap (ish) alternative to the 6990 for those building density systems.

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August 09, 2011, 08:46:54 PM
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silverstone st1500 required for 4 x 6870x2 card? 1500w

Each one of these cards requires a minimum 600w PSU according to the mfg site's product page. Four of these cards, incidentally, would require much more than a 1500w PSU - at least 2400w, and you definitely want some room to be comfortable for the purposes of stability and overvolting, so four of these dual-gpu cards would require multiple PSUs.
you gotta be kidding me. you go by manufacture recommendation? they ALWAYS overestimate. so far, i believe no graphics card goes over the 300w TPD limit (6990 exception), and they need to stay within this maximum because they won't be able to dissipate more heat in a double slot design (at reasonable noise levels).

getting a 2400w PSU for 4 of these just makes me laugh...

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.

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August 09, 2011, 09:09:40 PM
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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.
and as i said in my post, you shouldn't go off of manufacturer's recommendations, as they always overestimate the PSU power requirement. at least i sure hope you don't buy your PSU based on what the manufacture's say, because you're getting ripped off big time when it comes to mining. if you get a quality PSU, you can load it at 80% for 24/7 and it should be fine. a single 1500w is more than enough to power 4 of these, but two good 750-800w PSU should be a better buy.

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August 09, 2011, 09:10:30 PM
 #20

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 Wink

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

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