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#1 Aug 14 2010 at 4:39 PM Rating: Decent
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Out of curiosity: if i wanna run two GPUs in crossfire is there anything limiting me to using the same GPUs in both slots? I mean like do they have to be two 5770s or can it be one 5770 and one 5850 for example? i'm thinking of buying a 5870 and running it in crossfire with my 5770 - unless of course this would be useless, in which case I'd sell my 5770. Any tips?
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#2 Aug 14 2010 at 4:43 PM Rating: Good
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You can crossfire if the first two numbers are the same. Although, it's optimal if you use the same GPU.

Edited, Aug 14th 2010 6:45pm by Oenos
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#3 Aug 14 2010 at 4:47 PM Rating: Decent
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Care to explain why please? just out of curiosity so i understand this stuff a little better - also, what about the GTX cards, what can I crossfire there? also, can I crossfire two different makes? like one ATI and GTX? why or why not? if its too much explaining, a link will suffice :), thanks.
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#4 Aug 14 2010 at 4:54 PM Rating: Good
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To crossfire, the cards need to be of the same family, which would be 2 cards in the 5700s or 5800s, your example of the 5770 & 5870 wouldn't work. So if you're definitely getting the 5870, sell the other and maybe get a 2nd 5870 later on. You can't mix nvidia with ati like that...2 nvidia cards would be SLI and not crossfire. You'll also need to make sure your motherboard supports SLI or XFire. And you may have to upgrade the power supply as well.

http://game.amd.com/us-en/crossfirex_about.aspx

http://www.slizone.com/page/home.html
#5 Aug 14 2010 at 4:55 PM Rating: Good
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TwistedOwl wrote:
To crossfire, the cards need to be of the same family, which would be 2 cards in the 5700s or 5800s, your example of the 5770 & 5870 wouldn't work. So if you're definitely getting the 5870, sell the other and maybe get a 2nd 5870 later on. You can't mix nvidia with ati like that...2 nvidia cards would be SLI and not crossfire. You'll also need to make sure your motherboard supports SLI or XFire. And you may have to upgrade the power supply as well.

http://game.amd.com/us-en/crossfirex_about.aspx

http://www.slizone.com/page/home.html


Indeed this. The first two numbers of the cards (57XX or 58XX or 59XX) have to be the same for crossfire.

For SLI, I believe they have to be EXACTLY the same (460x2 or 470x2 or 480x2)
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#6 Aug 14 2010 at 4:55 PM Rating: Decent
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Has to do with the software/bios/chips used on the gpus.. ATI uses similar chips on thier 5700s and diff ones on thier 5800 ect.. Nvidia you have to use the same exact card number such as 460/8800 but dont matter if its the same like 768MB/1GB only matters on the chips..

Why you ask? Because they made it that way :p lol

Another reason Why prob so you have to buy next gen.. otherwise I would Sli my 8800/460 and probably do alright thus not needing to buy a higher price card and still have my investment from the 8800 usable.. Why would they want you to reuse ur old equip lol

Edited, Aug 14th 2010 6:58pm by Hypnotiq101
#7 Aug 14 2010 at 5:03 PM Rating: Good
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What everyone else said...

Basically the configurations are different between generations. For ATI, the first two numbers have to be the same to have similar configurations. NVidia has to be exactly the same, and it's called SLI, not Crossfire. You can't combine NVidia with ATI. You can combine different manufacturers though, like XFX 5870 with Sapphire 5870.
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#8 Aug 15 2010 at 5:52 PM Rating: Decent
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Thanks for all the replies - Im now considering selling my 5770 and buying a 5870, that card is a beast from the reviews i have seen on it...how much of a boost would it be to crossfire 2 5870
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#9 Aug 15 2010 at 8:05 PM Rating: Decent
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Quote:
Thanks for all the replies - Im now considering selling my 5770 and buying a 5870, that card is a beast from the reviews i have seen on it...how much of a boost would it be to crossfire 2 5870


Let me google that for you.
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