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post #31 of 68
Crossfire scaling for 3 cards is about a 50% performance increase based on what is currently being advertised. SLI scaling is about the same. Also, the cards cannot share memory so you will be bottlenecked by that no matter what, and since the 6970 has more memory than the 580 (albeit, not as fast), that might be a better choice. If you have the cash to spend why not just wait for AMD to release the 6990, which will give you much better performance since it will have 4GB memory and be identical to 2 6950's (except scaling is like 90% instead of 50%). If you really just want 3 cards though, I would get the 580's, because they are faster and nVidia has better drivers for the most part. But price and support wise, AMD's crossfire is better supported than nVidia SLI (excluding nVidia sponsored games). Also, the 6970's are much cheaper and do offer comparable performance. So to be honest it's your choice, but I would wait for the 6990.
Edited by Cam3ron - 12/26/10 at 12:04pm
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post #32 of 68
Quote:
Originally Posted by Cam3ron View Post
Crossfire scaling for 3 cards is about a 50% performance increase based on what is currently being advertised. SLI scaling is about the same. Also, the cards cannot share memory so you will be bottlenecked by that no matter what, and since the 6970 has more memory than the 580 (albeit, not as fast), that might be a better choice. If you have the cash to spend why not just wait for AMD to release the 6990, which will give you much better performance since it will have 4GB memory and be identical to 2 6950's (except scaling is like 90% instead of 50%). If you really just want 3 cards though, I would get the 580's, because they are faster and nVidia has better drivers for the most part. But price and support wise, AMD's crossfire is better supported than nVidia SLI (excluding nVidia sponsored games). Also, the 6970's are much cheaper and do offer comparable performance. So to be honest it's your choice, but I would wait for the 6990.
Why would the 6990 be better than 6950 CF? You have 4GB onboard only because it is 2GB for each onboard GPU, running concurrently. And no idea what you mean by 90% scaling vs. 50% scaling...CF scaling with two cards i already 90%.
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post #33 of 68
Please research your post. Cards that are crossfired cannot share memory. It is the same way 2 4-core opterons on a single board vs an 8 core opteron always lose. The 2 4-core's cannot share cache so they are slower at processing vs an 8-core which can share cache and has more of it.

As for the scaling your kinda right, it actually varies from game to game based on the support of crossfire for that game. So while some are 40% others are 80%, but the 6990 is always 90-95% no matter the game or even if it supports crossfire. DUAL GPU CARDS ARE NOT SIMPLY TWO CROSSFIRED SINGLE GPU CARDS STUCK TOGETHER!

Edit: Also the more anti-aliasing the higher the scaling.
Edited by Cam3ron - 12/26/10 at 12:24pm
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post #34 of 68
I am well aware that two cards in CF cannot share memory. But you are saying that the 6990 will access 4GB of vRAM? I am fairly sure you are confused here. The 5970, for instance, had 2GB vRAM combined, but it was still only effectively 1GB vRAM. Unless something is different, the 6990 will be the same story.

At any rate, you cannot prophesize the performance of 6990 with respect to scaling. The 5970 had to rely on scaling - this did not simply disappear because it was on one PCB. And in many cases its scaling sucked even worse than two 5870s in CF.

The same thing has been true of every dual-GPU card ever created. None have had any magic way around the realities inherent to SLI or CF scaling.
Edited by matrices - 12/26/10 at 12:29pm
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post #35 of 68
Get two GTX 580's and call it a day. There is nothing unless your going triple screen Metro 2033 that you would need a third. Dont even bring ATi into this, They are a crap high end video card company and you should never consider them until they rewrite their drivers from bottom-up.
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post #36 of 68
Obviously 3x SLI 580's Are Better. Is It The GTX?
post #37 of 68
I'm not saying that the disadvantages of scaling disappear in a dual GPU card. I'm saying that scaling doesn't really on the actual game and only the drivers for the card (still isn't a good thing in my opinion.) Also, newer games are getting larger and larger textures so more memory is a must. nVidia cards couldn't even play the chronicles of riddick assault on dark athena, until nVidia released a special driver to compensate for the memory.

Even though I have no clue of the performance of the 6990 (besides the design specs AMD has released), AMD has announced the the 6990 will have much improved scaling capabilities and will be linked using a different technology that is more like having two CPU cores instead of 2 GPUs on the same PCB. Anyways, I just think it would make more sense to wait for the 6990 because 3-6970s will smoke it sometimes but other times they will be bottlenecked at 20fps which isn't good...

Actually scratch all of that, don't listen to "SimplyTheBest" because nVidia cards rely too highly on the fact that most games support them and only test their cards for those games and write drivers for those games... Don't listen to me either, just get a PowerFX card and call it a day.
Edited by Cam3ron - 12/26/10 at 12:43pm
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post #38 of 68
go for 2 instead of3 - you barely increase any performance from 2 to the 3 (at least you won't see the difference) with that screen (as stated earlier) you won't be able to use that power you get with 3 anyway, normal SLI or CF would be enough for all the games you would want as of now.

Sorry if this has been said earlier, haven't read through the whole thread.
post #39 of 68
Thread Starter 
Ok well isee how things is going..Note i will be upgrading my screen to 3 X 30'' LED, just waiting on a good one to release, I am not really a fan of 3D sinc ei only have 1 eye, and 3D needs two eyes.

I have been using ATI for a while that this will hurt me alot. to let my babes go...but i feel that 580's will be the wise choice at this moment i like the beach i see in the owners club.

So will let this thread run for a week and then make up my mind.
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post #40 of 68
For pure hwbot scores, go with the 580's but for real world performance per dollar, stick with the 6970's.
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