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Can you crossfire 6870 with 6850?

post #1 of 27
Thread Starter 
i was wondering how much watt of psu you need to crossfire and get nice performance from those cards?

will it work?
and what i have to do .. to enable crossfire?
stick crossfire crossfire bridge & install ati catalyst? thats it ?

i have my old gigabyte radeon 6850 &
sapphire 6870

can my CPU handle crossfire?
i5 650
8gb 1333mhz ddr3
thanks for help smile.gif
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post #2 of 27
I don't think so.

I have seen a chart where you can CF different models, but they have to have the same number of shader cores, only allowed to have different clock speeds.

Which doesn't happen with the HD 6850 and the HD 6870, since one has 960 shaders and the other has 1120.
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post #3 of 27
Ive read a few places that you can. There was a thread in the past that kinda went into detail. Here it is.
http://www.overclock.net/amd-cpus/913796-6850-6870-crossfire.html

Stick the bridge on, enable crossfire in catalyst. And your cpu should be able to handle it. Just OC that cpu to 4.0-4.2 atleast.
Edited by Da1Nonly - 6/21/11 at 8:24am
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post #4 of 27
Yes, you can. You can crossfire cards of the same series. Example:

Any 68xx cards can crossfire

Any 69xx cards can crossfire

68xx + 69xx cannot crossfire.
post #5 of 27
Yes, but if You CF 6850 with 6870, the second one will run with settings of 6850.

Edit: And Yes Your CPU should do fine with them.
Edited by sp4wners - 6/21/11 at 8:26am
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post #6 of 27
Yes you can CrossFire, however your 6870+6850 will only run as fast as a 6850+6850. And it is to my belief that your CPU should not bottleneck your GPU's, but to be on the safe side, a generous OC would do the trick.
post #7 of 27
This is the most recent CrossfireX compatibility chart:
click here

6870, 6850 and 6790 are compatible because they are all based on the same chip. But the lower models have some disabled cores.

When you crossfire two or more cards with a different number of cores, they will all operate with the same number as the card with the lowest core count.

Edit: Personally, I don't think that's a bad thing. For example, if you've got a 6870 and a 6850 cf'd. They will run at the speed of 2x 6850's. Which is still very fast. The benefit of a setup like that is in games that do not support crossfire, because you will still get the full speed of a 6870.


Second Edit: I just feel like ranting now: The 6790 goes against the proper naming scheme. It's based on the Barts core, it's really part of the 6800 series which is why it crossfire's with the 6870/50 instead of the other 6700 series cards. It's proper name should have been 6830. Which would make MUCH more sense to anyone who truely understands AMD's gpu naming scheme. They named it 6790 for marketing reasons, because that sounds better for people who know a little bit about their naming scheme. It's the same reasoning why prices always end in 99cents, it just makes it sound better.
Edited by wedge - 6/21/11 at 9:33am
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post #8 of 27
Yes, you can crossfire anything within the same hundred class....

all cards that are 68..90,70,50 can crossfire.
post #9 of 27
Thread Starter 
great so this psu
http://www.corsair.com/power-supplies/modular-psus/professional-series-1/hx750w.html

will be fine?

or 650 watt corsair will be enought?
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post #10 of 27
Quote:
Originally Posted by insyxion;13953620 
great so this psu
http://www.corsair.com/power-supplies/modular-psus/professional-series-1/hx750w.html

will be fine?

or 650 watt corsair will be enought?

the one you linked should be more then enough... even that 650 should be good, if its a decent one. assuming that your getting the 650 version that you linked, then yes. you ARE GOOD 2 GO gunner2.gif
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