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3 580's 3gb or 2 6990's - Page 5

post #41 of 135
Quote:
Originally Posted by vipergod2000 View Post
I would never vote for the 6990s. The only dual GPU card I could ever recommend is the 5970. The 6990 and GTX 590 (although not part of the discussion) are plagued by the power issues, hence their downclocks, as the PCI-E + 8pin + 8pin are insufficient in powering the card to its full capabilities.

You'd be better off with 3 x 580s any day. They overclock way better, are not being held back due to the power, and nVidia scales much better in general.
Quote:
Originally Posted by TickleMeElmo View Post
1. Better overclocking headroom because you have more surface area and volume to dissipate the heat. If you are water cooling, Fermi seems to go further than does Cypress.
Huh? The first post is so full of wrong, I don,t know what to say.

It's funny how people don't have a clue what they are talking about, and just copy and pasting what they have read somewhere else about the 6990.

The 6990 on water can OC much better and HIGHER then 2X6970, and way better then the 580 3Gb.

And with the AUSUM BIOS, the 6990 is ALREADY at 6970 level stock. And there is no PowertTune limit, no OCP and no throttling with the AUSUM BIOS on the 6990.

On water, some 6990 are now reaching 1100/1375. Mine is at 1095/1375. At those clocks, the 6990 can go head-to -head with 580 SLI OC easily.

So no ''power issues'' or ''downclock'' since the 6990 cores are OCing BETTER then 2 separated 6970! Those 2 posts I'm quoting are misinformation, and totally untrue.

Forget the benchmarks made 1 months ago. There was no waterblock out for the 6990.

So I vote 2X6990. With waterblocks, BETTER overclocking then both the 6970 and 580 (hey I have one, not copy and pasting what I have read somewhere) .
    
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post #42 of 135
Quote:
Originally Posted by vipergod2000 View Post
I would never vote for the 6990s. The only dual GPU card I could ever recommend is the 5970. The 6990 and GTX 590 (although not part of the discussion) are plagued by the power issues, hence their downclocks, as the PCI-E + 8pin + 8pin are insufficient in powering the card to its full capabilities.
The 5970 was the very worst dual GPU AMD has every put out, and the 6990 is the very best.

This is not technology wise.
Its drivers wise.
The 5970 has so many issues with eyefinity, with crossfire, with support, that I pretty much threw that away.

It was extremely bad.

The 6990 takes the same power as the 5970 give or take a few W, and it scales so much better than the 5970 ever was.

If you consider 590 vs 6990, the 590 I'm afraid is pretty bad.


To the OP:
My vote is on the 580s.
Quad not always scale, and the 3GB of memory will give much better performance and a higher option for higher AA.

But 2x6990, well, the extra GPU does help a lot in some games.
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post #43 of 135
What I wonder is this: why does more VRAM allow for higher AA?
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post #44 of 135
3x GTX 580 3GB win hands down
post #45 of 135
Quote:
Originally Posted by steelbom View Post
What I wonder is this: why does more VRAM allow for higher AA?
It does not necessarily. People tend to make that comparison because AA causes more threads to be stored in the VRAM of the GPU (more pixel processing), but actually ROPs play the biggest part in AA. The ROPs have to be fast enough to process the geometrical operations.
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post #46 of 135
Quote:
Originally Posted by Levesque View Post
Huh? The first post is so full of wrong, I don,t know what to say.

It's funny how people don't have a clue what they are talking about, and just copy and pasting what they have read somewhere else about the 6990.

The 6990 on water can OC much better and HIGHER then 2X6970, and way better then the 580 3Gb.

And with the AUSUM BIOS, the 6990 is ALREADY at 6970 level stock. And there is no PowertTune limit, no OCP and no throttling with the AUSUM BIOS on the 6990.

On water, some 6990 are now reaching 1100/1375. Mine is at 1095/1375. At those clocks, the 6990 can go head-to -head with 580 SLI OC easily.

So no ''power issues'' or ''downclock'' since the 6990 cores are OCing BETTER then 2 separated 6970! Those 2 posts I'm quoting are misinformation, and totally untrue.

Forget the benchmarks made 1 months ago. There was no waterblock out for the 6990.

So I vote 2X6990. With waterblocks, BETTER overclocking then both the 6970 and 580 (hey I have one, not copy and pasting what I have read somewhere) .
Not an AMD fan since my first Athlon Slot A about 10 years ago, and relating to others based on my own surface level research of a brand which (sorry to say) I do not really support - is still considered a contribution.

I hardly think your trolling in the OPs thread is productive towards his objective. Fine, you own and prove the 6990s can do whatever blablabla ON WATER.

I've been an advocate of nVidia for my own reasons, backed up with my own research, and that I personally own a fermi, and the prior generations before that, dating back to the GeForce 256 DDR.

I'm not challenging you or anyone with my historical experience with the brand, but just saying I ain't your typical blurt mouthed kid that posts threads on 'what setup they want - $5k budget' to get a whole bunch of people posting their dream setups, wasting 30 mins researching on newegg, posting responses so to make this kid feel better about himself.

I read the first few reviews on the 6990 and yes, AMD was crowned, but the issues I highlighted WERE LEGITIMATE ISSUES HIGHLIGHTED IN THOSE REVIEWS - and were also true especially to the GTX 590.

That being said, if 1 x 580 takes in one 8-pin and one 6-pin PCI-E power connector, why would (logically) anyone assume that JUST TWO 8-pins powering TWO GPUs, would guarantee them sufficient - isn't that an obvious factor which anyone would be safe to assume? Sorry for ruining your day in tarnishing your prized possession of a flagship card
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post #47 of 135
Quote:
Originally Posted by Defoler View Post
The 5970 was the very worst dual GPU AMD has every put out, and the 6990 is the very best.

This is not technology wise.
Its drivers wise.
The 5970 has so many issues with eyefinity, with crossfire, with support, that I pretty much threw that away.

It was extremely bad.

The 6990 takes the same power as the 5970 give or take a few W, and it scales so much better than the 5970 ever was.

If you consider 590 vs 6990, the 590 I'm afraid is pretty bad.


To the OP:
My vote is on the 580s.
Quad not always scale, and the 3GB of memory will give much better performance and a higher option for higher AA.

But 2x6990, well, the extra GPU does help a lot in some games.
Well, from my limited knowledge of AMD branded products, I guess their worst, was my best to recommend. Should I just say "If you say so" ?

The 5970 had its plus points and reigned supreme for a while, as nVidia's last dual gpu card was a while back - hence my contributing to it's success. Benchmark reviews spoke a lot about the 5970 in frames per second. As newer cards came out, older cards, like the 5970 began diminishing their appearances in reviews to be replaced by newer generation cards, hence my point.
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post #48 of 135
Quote:
Originally Posted by TheBlademaster01 View Post
It does not necessarily. People tend to make that comparison because AA causes more threads to be stored in the VRAM of the GPU (more pixel processing), but actually ROPs play the biggest part in AA. The ROPs have to be fast enough to process the geometrical operations.
More threads? No, it doesn't require more threads.
And its not really pixel processing. Its color.

The simplest AA is pretty much render a picture of 1920X1080 (example) to 4 times its size, as if you are playing at 7680x4320, than it does the required color calculations, and change the color of eachpolygon's edges (or everything, depends on the settings or game wise).

This requires a huge amount more memory than normal.
Without AA most games can be easily run with 1GB, even in surround. But with AA you need twice as much memory because of the colors information stored.

This is the reason why 3GB on the special edition 580s makes a very big difference.
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post #49 of 135
Thread Starter 
Any idea when the egg will have 3gb 580's in?

I'm not gonna lie 2 6990's under water sounds uber sweet. But with 3 580's with 3gb of vram each and under water in my opinion is the way to go.

Edit: Anyone know, I would love to order them from newegg. Guess i'll have to pick them up from the 'zon.
Edited by Coolio831 - 4/17/11 at 11:01am
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post #50 of 135
Quote:
Originally Posted by Diabolical999 View Post
How about: HD 6990 + HD 6970 + GTX 460 PhysX
This

If money is no object, get the 3GB 580's. But really, the 40% cost increase over the above option will get you ~5% tops more performance.

Do you plan on running 3240x1920?
    
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