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7870 XT and R9 280X?

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  • Graphics Cards
  • Crossfire
  • Graphics
Last response: in Graphics & Displays
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October 19, 2013 1:18:33 AM

Is it possible to crossfire a 7870 XT and a R9 280X? I'm guessing you can since they're both Tahiti but I want it confirmed.

More about : 7870 280x

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a c 172 U Graphics card
October 19, 2013 1:23:18 AM

Yes; but why? I would think that the 7870 XT would be a bottleneck to the R9 280X capabilities.
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a b U Graphics card
October 19, 2013 1:36:07 AM

yes but it would just be like two 7870 XT in CF.
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October 19, 2013 1:55:37 AM

ksham said:
Yes; but why? I would think that the 7870 XT would be a bottleneck to the R9 280X capabilities.


I'm already using a 7870 XT and since I have the money for a R9 280X I was wondering if I could crossfire them. If I change the clock speeds would it still bottleneck?
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a c 172 U Graphics card
October 19, 2013 2:10:54 AM

Clock speed isn't everything. Just like in CPUs. A CPU may run at 3.0 GHz and another at 3.5 GHz. That does not necessarily mean that the first one is slower. It comes down to implementation and IPC (instructions per clock cycle). If the former has a higher IPC, it will perform faster even at lower clock speed.

So to answer your question, yes. But not bottleneck in the sense that it won't work. When I said bottleneck, I meant that you are wasting money on the R9 280X when it will be underperforming because it is being held back by the HD 7870 XT, which is (in all intents and purposes) a bottleneck to the R9 280X. Anything preventing something else from being able to perform to its maximum potential is a bottleneck.
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