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Two GTX 580's or One GTX 590 Dual GPU?

post #1 of 26
Thread Starter 
I know this is a bit premature but seems in about 2-3 weeks the new EVGA GTX 590 dual GPU video card is coming out.

I'm within my step-up program time frame and starting to give some thought to this.

Would two GTX 580's be better than one GTX 590 dual GPU single video card?

The GTX 590 is a beast 11" long and takes two 8pin power connectors. Luckily for me I can remove my middle HDD cage in my case and make room.

I won't be able to run two GTX 590's I'm assuming since motherboard only handles SLI mode not TRI or Qaud. I have a 1 kilowatt PSU. So I'm assuming that I can't SLI these two GTX 590's with a two PCIe mother board that are close together?

It also looks like it has more width than one GTX 580 and if it does two of the GTX 590's won't fit flush together. I don't have any space bewteen two single cards as is when I SLI the GTX 580 it will be flush together.

I've never run a single dual gpu video card and curious on which solution might fit my needs for the most power in my rig for performance.

Does the single dual GPU video card run as well as two in SLI mode?

In situations where gaming or video doesn't take advantage of two cards does the single dual gpu card work with twice the bandwidth and fillrate or is it limited in performance?

Example the one GTX 580 card is running 40.2Gpixles and 201.8 Gb's bandwidth, will the new GTX 590 be about 80 Gpixles and 400 Gb's bandwidth at all times? Or is the GTX 590 limited and only take advantage of the dual gpu's in SLI capable gaming?

Thanks for anyone who understands dual gpu's and posts explain this.
     
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post #2 of 26
hard to say since there's just not enough info about it yet. I would wait for the 590(or 595?) to be released before making that decision.

Scaling wise, I assume 2x 580s will trump over a single 590.
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post #3 of 26
Not sure if this would make a difference, but with the 590 all the data will be going over a single PCI-E 2.0 16x lane. In SLI the data will get to utilize 2 16x lanes.
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post #4 of 26
Seeing as you have a full tower setup go sli with another gtx580
post #5 of 26
Better of with 2 x GTX580s.
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post #6 of 26
Quote:
Originally Posted by Arizonian View Post
I know this is a bit premature but seems in about 2-3 weeks the new EVGA GTX 590 dual GPU video card is coming out.

I'm within my step-up program time frame and starting to give some thought to this.

Would two GTX 580's be better than one GTX 590 dual GPU single video card?

The GTX 590 is a beast 11" long and takes two 8pin power connectors. Luckily for me I can remove my middle HDD cage in my case and make room.

I won't be able to run two GTX 590's I'm assuming since motherboard only handles SLI mode not TRI or Qaud. I have a 1 kilowatt PSU. So I'm assuming that I can't SLI these two GTX 590's with a two PCIe mother board that are close together?

It also looks like it has more width than one GTX 580 and if it does two of the GTX 590's won't fit flush together. I don't have any space bewteen two single cards as is when I SLI the GTX 580 it will be flush together.

I've never run a single dual gpu video card and curious on which solution might fit my needs for the most power in my rig for performance.

Does the single dual GPU video card run as well as two in SLI mode?

In situations where gaming or video doesn't take advantage of two cards does the single dual gpu card work with twice the bandwidth and fillrate or is it limited in performance?

Example the one GTX 580 card is running 40.2Gpixles and 201.8 Gb's bandwidth, will the new GTX 590 be about 80 Gpixles and 400 Gb's bandwidth at all times? Or is the GTX 590 limited and only take advantage of the dual gpu's in SLI capable gaming?

Thanks for anyone who understands dual gpu's and posts explain this.
An actual dual-card setup usually performs slightly better than an identical dual-GPU card, but it's usually a very small difference ... again, that's assuming identical cards. A good example would be a 2xGTX275 vs a GTX295 (clocked to 275 clocks) ... this yields around 5-10% advantage for the two physical cards.

If you have two PCI-Ex slots of 16x size, you can do quad-SLI with 2 dual-GPU cards (in terms of your board 'supporting' such a config). I dunno about the spacing issue but I presume the 590 will only be a dual-slot card so quad-SLI should be possible. Ridiculous, but possible

With either a dual-card setup, or a dual-GPU single card setup, if SLI is not supported, you will get performance identical to what you'd get with just one card. However, this is very rare except sometimes when games first come out.

It's key to understand that both scenarios are just basically two independently-operating cards in SLI (even if both are on one board), so you really can't properly double the specs for one of the two cards (although the GPU makers love to do so with their dual-gpu card marketing). However, if you just put a '2X' in front of the specs for one card (as I did below), then that's sort of accurate

Thus, no, you won't get 80GPixels and 400GB bandwidth at all times on either config. First off, SLI has to be supported, for sure. Secondly, SLI scaling is not 100%. LIke I said, its not really even appropriate to double any of the numbers like that.

What you have, in either case: single card (two gpu's on one card in SLI with each other), or two cards (two gpu's on two cards in SLI w/each other) is:

2 cards @ 40Gpixels each
2 cards @ 200GB/s bandwidth each
2 cards @ 1.5MB each (meaning 1.5MB total vram capacity since the data is mirrored onto both cards memory banks)

Basically, the long and short is that there is virtually no benefit to a single-card dual-GPU solution vs. the same two cards in SLI, aside from probably using a bit less power, probably costing a bit less, perhaps being quieter (no guarantee), taking up less space/slots and (typically) fewer power connectors. Note that performance-wise, it's never better than two (identical) physical cards in SLI. And also note ... if a dual-gpu card goes bad ... the whole thing is typically bad. Plus you can't sell it 'separately' like you can w/two in SLI.

BTW, did you read for certain that the 590 is going to be 2 fully-functional GF110 chips? I would really have thought they'd go with 2xGF114 for their first Fermi dual-GPU card. They might actually be able to SELL some of those ...
Edited by brettjv - 1/26/11 at 12:35am
    
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post #7 of 26
Thread Starter 
Thanks Brettjv....I think I get it now.

I hear the rumor is the dual GTX 595 GPU is two GTX 560's put together.

So if that's true then where only single card only can be utilized it's only as good as one GTX 560 and the second gpu in that dual set up is wasted just like two cards seperately in SLI mode. It would actually be less performance than one GTX 580 in those single card situations even though it's a GTX 595?

Furthermore two dual GTX 595's gpu's in SLI mode is only as good as one GTX 560 performance where only one card can be utilized.

However where multiple cards can be utilized it would be like qaud GTX 560's vs two GTX 580's in SLI mode.

Did understand this correctly?
     
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post #8 of 26
Quote:
Originally Posted by Arizonian View Post
Thanks Brettjv....I think I get it now.

I hear the rumor is the dual GTX 595 GPU is two GTX 560's put together.

So if that's true then where only single card only can be utilized it's only as good as one GTX 560 and the second gpu in that dual set up is wasted just like two cards seperately in SLI mode. It would actually be less performance than one GTX 580 in those single card situations even though it's a GTX 595?

Furthermore two dual GTX 595's gpu's in SLI mode is only as good as one GTX 560 performance where only one card can be utilized.

However where multiple cards can be utilized it would be like qaud GTX 560's vs two GTX 580's in SLI mode.

Did understand this correctly?
I edited my first post a bit there may want to read again. And you know, we have a special way we show appreciation here on OCN

If we accept that 595 = 2xGTX560, if SLI isn't supported in the particular application, then whether you have 1 or 2 GTX595's, you will get the performance of 1xGTX560, yes.

Honestly though ... people here talk a LOT about the perils of games not supporting SLI, but I'm here to tell you ... I've been running x-fire or SLI for a couple years now, and this does NOT happen often.

AFA quad-SLI vs 2x580 goes, yes, what you said is the general equation.

BUT ... quad-SLI scaling tends to not be as good as dual-SLI scaling. IOW, the gain from the 2nd 580 will be larger, %-wise, than the gain from the 2nd 595. Now, quad-SLI may still be FASTER by virtue of one 595 being faster than one 580, but I'm just talking scaling here.

Lastly, if the GTX595 is only 2x1GB memory structure, I wouldn't even think of quad-SLI with that. It's just too much GPU power relative to the vram amount. EDIT: However, if the 595 is 2xGTX560 each w/2GB of vram, it becomes a somewhat intriguing proposition. But all this is contingent on having a surround and/or 3d config. A single 2d monitor setup you really only need a single 580, honestly. Or 470/480/570 in SLI at most.
Edited by brettjv - 1/26/11 at 12:59am
    
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post #9 of 26
Thread Starter 
I read on Legit Reviews is the GTX 595 is the reference design PCB of dual-GF110. They claim the single PCB video card will come with a pair of GF110 GPUs linked by a bridging chip, possibly the NF200. They also believe the card has 3GB of memory, shared evenly between the two graphics processors.

Could be two GTX 580's? IF it is then the one dual GTX 595 would be as good as two GTX 580's in SLI mode or single card mode. Then I'd strongly consider the step up program from EVGA.

Edited: Wait I wouldn't .... my system can't take four GTX 580's so I wouldn't be able to SLI two dual GTX 595 gpu's. I'd just SLI a second GTX 580 instead. That would be a lot of power. LOL.
     
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post #10 of 26
Most likely the 590 (or 595) will not be equal to 2x580s.
From heat point of view, and power, it doesn't make sense for it to be.
They will need a very strong cooling solution in order to make it work well, which in turn will make it way too costly.

Marketing point of view, it will not make sense as well.
If you can sell 2x580s for 1000$, you will not sale an identical card for those two, for 900$. The margine will be to low, and the dual GPUs don't see as well anymore, as a single top card today, is enough beasty to be enough for almost every game.

Most likely, the dual GPU will be either two 570s or two 560s (the latter makes more sense).

So two 580s will be stronger, and I think much more than 10-15%.

And I would just say wait the 2-3 weeks and see when it comes out. Don't forget that AMD should come out with its 6997 or 6995 pretty soon as well, as they won't be left behind on that wagon.
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