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can u crossfire 2 gig card version with a 1 gig

dave117

dave117

dave117

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Joined
31 Oct 2009
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12
what would happen would the 2 gig card then scale down to a 1 gig or would u have 3 gigs??

also could u cross fire a 5970 with a 5870 vapor x??
incase i wanted to add a card later?

and can u crossfire a 5870 vapor x with a standard 5870??

cheers
 
The 2 gig card would scale down to 1 Gb, giving you a total of 1 Gb.

Crossfire memory doesnt add up, you only get however much the lowest cards has.
 
incorect the 5890 is a dual gpu card with each gpu having 1gb of memory the clock speed is also slower than a 5870.

So if tri fire worked the 5870 would be downclocked on the core to match the 5890 methinks.
 
u can crossfire a 5970 with a 5870 vapor x

u can crossfire a 5870 vapor x with a standard 5870

if u crossfire a 2gb card with a 1gb card it'll go down to total of 1gb

if one of the card as higher clock than the other it doesn't matter, they'll both run at they own clocks.
 
CraigN said:
incorect the 5890 is a dual gpu card with each gpu having 1gb of memory the clock speed is also slower than a 5870.

So if tri fire worked the 5870 would be downclocked on the core to match the 5890 methinks.
Click to expand...

This
 
unknownsock said:
The 5870 would be downclocked to the 5970 speed.
And you would have a total of 1GB memery no down scaling, just the bandwidth as 3GB.
Click to expand...
u can't crossfire from two different series. the 5900 is a new series so u can only crossfire a card from that series,

e.g 5850 + 5870 or 5870 + 5870 or 5850 + 5850.

as for downclock it doesn't. e.g if u crossfire a 5850 + 5870 the 5870 clocks don't drop down to the 5850 clocks, they both stay at they own clock speeds
 
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The 5870 wouldn't downclock, but it would run the same as it, by either not utilised as much, or having to stop/wait for the slower card, where as Nvidia's SLi is different, that doesn't do one card stopping/waiting, that does matching clock speeds, they are both just basically coming out with the same thing at the end (matching cards), just both are getting there differently.
 
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gareth170 said:
u can't crossfire from two different series. the 5900 is a new series so u can only crossfire a card from that series,

e.g 5850 + 5870 or 5870 + 5870 or 5850 + 5850.

as for downclock it doesn't. e.g if u crossfire a 5850 + 5870 the 5870 clocks don't drop down to the 5850 clocks, they both stay at they own clock speeds
Click to expand...

I think this is wrong, you can crossfire a 5970 with a 5870 as the 5970 is basically 2 x 5870 in crossfire with lower clock speeds. Its really just the same as a 4870x2 crossfired up with a 4870 1gb card. The only difference is in this round they dropped the x2 and decided on 59**. With your logic they would be stopping a lot of people using tri-fire.
 
You can crossfire different memory amounts and different clock speeds and the fastest cards lower their specs to that of the slowest card in the set up.

If you have a true 2Gb card and a 1Gb card then the 2Gb card will simply dial down it's available to 1Gb.

On a seperate note you need to be careful with cards sporting 2Gb, if you're talking about a multigpu card such as the 4850x2, 4870x2 or 5970 then it's total available memory is half of the advertised total, each GPU needs it's own memory so these cards only run with 1Gb per core.

One last thing to note about the 5970 is that it's clock speeds are slower than 5870s so with a 5970+5870 config the 5870 will dial it's clocks back, you can avoid this by overvolting and overclocking the 5970.
 
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