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Old February 3, 2010, 01:59 AM
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Default To xFire? or not to xFire?

Hey fellas, i need some insight and guidance

What are the rule of thumbs when deciding to xFire GPU cards?

A More specific question: Are the 4000 series of ATI cards compatible to xfire with the 5000 series? Namely the 4770 and the 5770

I have a 4770 in my rig at the moment and i like it and all, but ive got my hands on a 5770 card, now while i would like to just plug to two together and see how that rolls ive never actually xfire'd cards before..So what will i be looking at here? Can i do this? And if i can..Do i have to uninstall all the 4770 Drivers before i can install the 5770? Are these chipsets even compatible??


Thanks fellas, these questions are bugging me, ill look around and see if i can find some articles on xfiring ATI card.. Im an ATI GPU hardcore fan.
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Old February 3, 2010, 06:22 AM
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I'm pretty sure the rule is that the generation needs to be the same for the cards. (First 2 digits match) So you could XFire a 4850 and a 4870, but not a 4770 and a 5770. (Someone correct me if I'm wrong.)

However you wouldn't want to XFire them even if you could. XFire sets both GPU's to the lowest common denominator. Meaning the higher GPU will clock down to match the lower GPU. That's why you never see matches like a 4890 and a 4850, because the 4890 would get dumbed down to match the lower card... making it better off on it's own.
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Old February 3, 2010, 06:29 AM
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yup the generations have to be the same to crossfire
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Old February 3, 2010, 08:07 AM
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Quote:
Originally Posted by Caldezar View Post
I'm pretty sure the rule is that the generation needs to be the same for the cards. (First 2 digits match) So you could XFire a 4850 and a 4870, but not a 4770 and a 5770. (Someone correct me if I'm wrong.)

However you wouldn't want to XFire them even if you could. XFire sets both GPU's to the lowest common denominator. Meaning the higher GPU will clock down to match the lower GPU. That's why you never see matches like a 4890 and a 4850, because the 4890 would get dumbed down to match the lower card... making it better off on it's own.

according to ATI tech support, this isn't true.
When I asked them about this specifically, they told me the only thing that "clocks down" is the amount of memory.
The clocks work the same, but if you mix a 512mb card with a 1 gb card, 512 will sit idle on the 1gb card.
Nothing else is affected.
I've heard otherwise in many many places, but this comes directly from ATI techs.
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Old February 3, 2010, 09:36 AM
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Thanks for the replies guys, after browsing this place to no ends, i figured it would be safer to just use my 5770 solo and just use the 4770 on another rig. And there no point if i cant gain the full potential of the 5770 xfired, ill probably buy a second 5770 as well then xfire those two on my current rig..it needs a beef up! or better yet I WANT a BEEF UP....at a reasonable price of course
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Old February 3, 2010, 10:19 AM
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I had 2 x 5770s in xfire and it was great. Even 1 single 5770 is no slouch by any means.
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Old February 3, 2010, 11:13 AM
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Personally I wont Xfire these, I would use a single 5770 and when it will not be enough sell it and get a higher end card. I am clueless for the 4770-5770 cross fire sorry.
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Old February 10, 2010, 06:52 PM
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Quote:
Originally Posted by Canzara View Post
according to ATI tech support, this isn't true.
When I asked them about this specifically, they told me the only thing that "clocks down" is the amount of memory.
The clocks work the same, but if you mix a 512mb card with a 1 gb card, 512 will sit idle on the 1gb card.
Nothing else is affected.
I've heard otherwise in many many places, but this comes directly from ATI techs.
you can listen to an ATi tech, or try it yourself. Overclock one of your two cards, and see if there are any changes in your benchmarks (more than +- 2%). I've tried it and believe me, there are no changes, therefore the slower card is what determines your Xfire scaling. What you said about memory is true though.
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Old February 10, 2010, 06:54 PM
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back to the OP though, why are you contemplating Xfire? What are you using currently that you want to double up on? If you're starting a fresh computer, it's always better to get a stronger single card than dual cards that when Xfire/SLI'd produce similar performance. Xfire/SLi still produce microstutter in some instances, and scaling changes from game to game.
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Old February 11, 2010, 06:03 AM
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if you crossfire 2 different cards say 4850 with a 4870 which i did if you don't turn 1 of the cards up or down to match there speed you will and can get a micro stutter that makes playing any game crappy this is from experience not something i read on a forum. so I thought maybe just bad luck so i tried a regular 4870 with mine but my one is a palit and is overclocked so the speeds are different i had to under-clock my 4870 to stop the stutter and that's with two of the same cards running at slightly different speeds.
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