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1 powerful card or 2 in sli/crossfire?

post #1 of 51
Thread Starter 
would one of these http://www.newegg.com/Product/Produc...ords%29&Page=1 be better or would 2 lesser cards in either sli or crossfirex?
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post #2 of 51
You'd be running that card in Crossfire, since it has 2 GPUs.

Crossfire 6970s will be faster seeing as the 6990 is slightly downclocked.
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post #3 of 51
A single powerful card is always my choice over two lesser cards. There was a news article recently on micro stuttering in SLI / Crossfire systems that, to me, basically proved that this notion is correct: http://www.tomshardware.com/reviews/...fire,2995.html
Edited by kremtok - 10/18/11 at 9:09pm
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post #4 of 51
Thread Starter 
so i would get better performance from 2 6970s?
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post #5 of 51
Since the 6990 is dual GPU on a single PCB, it will perform slightly slower than 2 cf'd 6970s. If you overclock it it will be almost or as fast. Keep in mind that you won't have the stuttering issues (negligible but still there no matter how good CF scaling might be) or driver issues that having 2 cards brings with it.

Also, noise and heat might be a concern. If your board has the PCIe slots spaced so that 2 CF'd cards do not have any room between them, dual 6950s/6970s would be louder and possible hotter. If your board leaves breathing space between the 2 cards crossfire 6900s would probably be a quieter option.

The 6990 is a loud card, and relatively hot too. If you want to overclock it you would probably need an aftermarket cooling solution.

It boils down to this:
If you don't plan on upgrading or you are uncomfortable with installing new waterblocks or heatsinks, go with 2 6950s in Crossfire. Unlock them to 6970s and they will blow the 6990 away, while staying quieter and cooler.

If you are feel like you might want even more performance later on and are OK with installing waterblocks/aftermarket cooling, go with a 6990. Watercool it and overclock it and it will be just as fast as dual cards. Since your power supply would handle it you could also add a second 6990 later on. Naturally stock cooling wouldn't even be an option if you're crossfiring 6990s. They're just too loud.
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post #6 of 51
I think I saw some where that 2 6850's were beating a GTX 580. With rebates you can get 6850's for around 100-125 bucks each
    
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post #7 of 51
Quote:
Originally Posted by kremtok View Post
A single powerful card is always my choice over two lesser cards. There was a news article recently on micros tuttering in SLI / Crossfire systems that, to me, basically proved that this notion is correct: http://www.tomshardware.com/reviews/...fire,2995.html
this^

i havent had SLI/CF before but i`v heard it many times that single cards are better (less power needed , better stability.....)
    
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post #8 of 51
The HD 6990 is basically two HD 6970 cores on one PBC. The same. It doesn't nullify microstutter or driver conflicts. I would still get two individual cards over one dual-GPU. Easier to cool, quieter (the 6990 has a notoriously loud stock cooler when overclocking), and can usually be overclocked better on air before requiring a block.
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post #9 of 51
Quote:
Originally Posted by kremtok View Post
A single powerful card is always my choice over two lesser cards. There was a news article recently on micros tuttering in SLI / Crossfire systems that, to me, basically proved that this notion is correct: http://www.tomshardware.com/reviews/...fire,2995.html
But in this case, a 6990 is running Crossfire even though it's a single card.
    
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post #10 of 51
I'd go for a single one, Gives you the ability to sli/xfire in the future.
   
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