Can I crossfire my sapphire r9 280 dual-x with a sapphire HD7870 ghz edition?

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Solution
Creme


Actually, a 7870XT can be crossfired with a 7950/7970/R9 280/280X, but not a 7850/7870 or R9 270/270X.

To answer OP, the R9 280 can be crossfired with:
-7870XT (Tahiti LE)
-7950
-7970
-R9 280
-R9 280X

The 7870 can be crossfired with:
-7850
-7870
-R7 265
-R9 270
-R9 270X.

From what I've read, crossfiring two different cards will limit the stronger card to the same level of the weaker card. So, a 7850 with a 7870 is the same as two 7850s. I might be wrong though, it could be hybrid crossfire.
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Azn Cracker

Azn Cracker

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Jul 28, 2009
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False.

they have to have the same gpu architect. The r9 280 and the 7870 have different ones. So you cannot

You can crossfire a r9 280 with a 7950 since those are the same gpus.

---

Note this may change with direct x 12 where I think you can xfire different cards.

 
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Creme

Creme

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Aug 4, 2014
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Actually, a 7870XT can be crossfired with a 7950/7970/R9 280/280X, but not a 7850/7870 or R9 270/270X.

To answer OP, the R9 280 can be crossfired with:
-7870XT (Tahiti LE)
-7950
-7970
-R9 280
-R9 280X

The 7870 can be crossfired with:
-7850
-7870
-R7 265
-R9 270
-R9 270X.

From what I've read, crossfiring two different cards will limit the stronger card to the same level of the weaker card. So, a 7850 with a 7870 is the same as two 7850s. I might be wrong though, it could be hybrid crossfire.
 
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Solution
Martell1977

Martell1977

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Oct 26, 2010
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No, the 7870 was rebadged as the R9 270X. The 280 was from the 7950 and the 280X was a slightly underclocked 7970ghz edition.

You could crossfire them as:
7870+R9 270X
7950+R9 280

They have to be the same GPU model, but due to rebadging, not the same series.
 
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G

ghostyou

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Nov 27, 2015
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ok so looks like your question was covered so adding in a little side question on same topic matter if i can.

so looks like i can also crossfire R9 280-R9 280X with no problems as well??
 
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Martell1977

Martell1977

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Oct 26, 2010
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Yes, but the 280X will be limited to the speed of the 280. It will be the same as having 2 x R9 280's. Crossfire and SLI sync the cards to the weakest of the 2, and to the lowest amount of memory. So putting a 4gb card with a 2gb card will mean you end up with a total of 2gb VRAM.
 
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G

ghostyou

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thx my r9 280 has 3gb and so does the r9 280x so only pulling back the 280x a tiny bit to hopefully see some improvement on the single card runnning.

A may be getting 2x 280x and thinking I can crossfire up to 4 cards on my mother board. should I try all 3 cards or go for the 2x 280x and leave the 280 out?

mother board is Asus formula V
All cards a sapphire
2x R9 280x - Sapphire Radeon VAPOR-X R9 280X 3GB GDDR5 OC
1x Sapphire Dual-X R9 280 OC with Boost
 
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Martell1977

Martell1977

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Oct 26, 2010
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If you get another 280X, just leave the 280 out or sell it. 3-way Crossfire can be problematic and heat management would be horrible.
 
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ghostyou

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Thx got a hd 7950 and still haveing some set up problems... like radeon setting not giving me the option to crossfire it

have some screen shots but can't load them here? GPU-z says that AMD Crossfire is Disabled (CrossFire available) but Radeon setting doesn't have the option in globle settings. I do get a option in each game profile for setting amd crossfire mode but this does nothing when running the game.

 
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