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crossfire vs. Sli

post #1 of 13
Thread Starter 
Just out of curiosity... what do you guys think is the better setup for gaming?
I am an Nvidia guy myself but am more intrigued by the versatility of crossfire over SLi. What do you guys think and why?
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post #2 of 13
CrossFire is setup so 1 GPU does top half and one does bottom half

SLI is setup so the GPUs do every other pixel.

I really think Crossfire or SLI doesn't matter, its the GPU that you are using that matters.
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post #3 of 13
Quote:
Originally Posted by pauldovi
CrossFire is setup so 1 GPU does top half and one does bottom half

SLI is setup so the GPUs do every other pixel.

I really think Crossfire or SLI doesn't matter, its the GPU that you are using that matters.
Technically, thats incorrect. Crossfire's default preference for rendering is AFR, or alternate frame rendering which means both cards render the whole frame (every pixel on the screen) but one card does all the even numbered frames, and the other does all the odd numbered ones.

The mode which you are talking about is called the Scissor mode, an alternative that CrossFire defaults to when CrossFire doesn't have the necessary application profile for AFR. Scissor and SuperTiling (every other pixel on the screen) are known to be bad for performance, in some cases being 50 percent worse than a single ATI card solution.. not exactly recommended... ATi said they were working on a solution to this problem as it is driver oriented, no fruits have come of this "work".

As for SLI, I didn't even bother researching what SLI does, because its probably more or less the same as CrossFire anyways, just without the dongle but a PCB bridge, some would like to complain the external dongle has numerous problems and causes a loss in performance well... I would like some on that one kthx. But it is more annoying to set up, if thats an issue for you. Both solutions are currently very good, as ATI just released the RD580 chipset which allows dongleless dual card solutions for video card series below the x1800, soooo ATI and nVidia are on par with each other... it just depends on what ur looking for in a dual card solution.... For performance, its currently the x1900xt crossfire, which will outdo the upcoming GF 7900 SLI solution (dont ask for proof, search it up yourselves).
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post #4 of 13
Goto Guru3d and check out both crossfire and SLI and you'll find that SLI will destroy crossfire(missfire).
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post #5 of 13
I believe a quick browse around the Internet will prove the above statement to be rather biased and false.
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post #6 of 13
SLI actually makes each GPU render 1 half of the screen, either left or right, hence why the clocks need to be the same, but since 1 card is doing hald the work it normally does it can output higher framerates.

The 1 MAJOR thing with Crossfire is you HAVE TO HAVE a Master card, there's no way around it. From what I hear they are hard to find. SLI on the other hand, all you need is 2 identical cards, pop a bridge on them (comes with the SLI mobo you have) and you're good to go.

I dont see why people ***** about the SLI bridge when it's an internal connection, big freaking deal. Crossfire has an External connection between 2 cards via a Crossfire cable. I already have enough damn cables coming from my computer, I dont need another. The more that is inside the better.

Either one doesn't make much of a difference unless you are running a high Resolution monitor (1600x1200 and up) since 1 card can't handle high resolutions and give out the 60+ framerates for First Person Shooters which is what a lot of gamers play

Quote:
I believe a quick browse around the Internet will prove the above statement to be rather biased and false.
You might be suprised that most review sites claimed that Crossfire was buggy and hard to setup and sometimes took a couple hours to function properly. When you have the above problems and another technology that has little to no flaws then you have to agree that it is a huge Missfire. Granted as time goes on it will get better, just like SLI had it's problems at the beginning. But for the time and hassle to set it up, not to mention trying to find the proper equipment for it, SLI is the better choice for those who want an easy Dual-GPU configuration
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post #7 of 13
Ok, let’s clear this up:
SLi works with either AFR or SFR. AFR is where the GPUs render the frames alternately, evens and odds. Some games prefer this over SFR, which splits the screens between top and bottom dynamically when the load gets higher or lower. Doom3 likes AFR, FarCry likes SFR. It’s a game to game type of thing. Right now, CrossFire gives the best possible performance of any setup. See the chipset link in my signature.
Also, in terms of difficulty, CrossFire has vastly improved. Sure, it is not as easy as SLi in most cases, but it is not loads harder either. Just a few software fixes (Something ATI is very good at), and CrossFire will be just as easy to setup as SLi.
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post #8 of 13
I remember reading about SLI being just as buggy to set up in the beginning.

Right now, SLI is more established and therefore better performing on most if not all levels.


***EDIT

To Sun,

While I am very excited to read about and see what the RD580 can do, it is still being reviewed. We all know how reviews are, and what products have been chosen to be reviewed.

The jury is still out on who is the best for overclocking and which is the best for performance: SLI or CF.

To my understanding, both SLI and CF are on virtually the same level from a capability standpoint.
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post #9 of 13
I'd go w/ SLI if not for anything else than that it is a proven technology that has been out for some time. it is easier to set up and is supported by more games. (and even those that aren't you can easily manually make profiles) Plus you don't have to have a master card or an extrenal 'bridge' connecting the cards.

Plus, SLI has moved to the point where updated drivers are allowing non-SLI boards to run SLI so SLI is clearly the leader on almost all fronts.... although I'd still get a real SLI board if I was planning to run SLI
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post #10 of 13
Quote:
Originally Posted by GatorLCA
The 1 MAJOR thing with Crossfire is you HAVE TO HAVE a Master card, there's no way around it. From what I hear they are hard to find.

Crossfire cards arent hard to find. Maybe on newegg, but my local pc shop has loads of each type, so do other norwegian stores. If the demand is so high in USA, where we get our cards from then where DO our cards come from then?
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