crossfire with different cards

[MatthewLynch]

If I corssfire two different graphics cards, will they perform both as the slowest or les powerfull graphic card or will they both perform at max?

[Godlygamer23]

What cards? They have to be specific tiers in order to work.

[dalekphalm]

If I corssfire two different graphics cards, will they perform both as the slowest or les powerfull graphic card or will they both perform at max?

It entirely depends on which two GPU's you want to crossfire:

http://support.amd.com/en-us/kb-articles/Pages/Crossfire-Chart.aspx

http://support.amd.com/en-us/kb-articles/Pages/AMDCrossFireFAQ.aspx

 

Crossfire is more flexible with differing GPU's compared to SLI.

 

Also, see this:

http://support.amd.com/en-us/search/faq/231

[kameshss]

It has to be the same Model no.

 

It can be done like R9 290 with R9 290. But it doesn't matter which brand they are coming from. But the Higher speed's clock speed will be

 

lowered down to match the lower speed one.

 

But not like R9 290 with R9 280.

[dalekphalm]

It has to be the same Model no.

 

It can be done like R9 290 with R9 290. But it doesn't matter which brand they are coming from. But the Higher speed's clock speed will be lowered down to match the

 

lower speed one.

 

But not like R9 290 with R9 280.

That's not entirely correct. With the 200 and 300 series GPU's, the tiers are more rigid, but you should still be able to crossfire a 290 and a 290x for example (in theory - though they specifically advise you not to do this). Ideally you would pair a 290 with a 290 though, as you stated. That would provide the best experience.

 

With the HD 7000 series, you can use more configurations. See my links above.

[tomas710]

That's not entirely correct. With the 200 and 300 series GPU's, the tiers are more rigid, but you should still be able to crossfire a 290 and a 290x for example (in theory - though they specifically advise you not to do this). Ideally you would pair a 290 with a 290 though, as you stated. That would provide the best experience.

 

With the HD 7000 series, you can use more configurations. See my links above.

Also you can CF 300 series cards with their equivalent 200 series ones since they use the same GPU (290x and 390x, 290 and 390, 285 and 380, etc)

[kameshss]

That's not entirely correct. With the 200 and 300 series GPU's, the tiers are more rigid, but you should still be able to crossfire a 290 and a 290x for example (in theory - though they specifically advise you not to do this). Ideally you would pair a 290 with a 290 though, as you stated. That would provide the best experience.

 

With the HD 7000 series, you can use more configurations. See my links above.

Yep.

 

I agree with that ^^^

[kameshss]

Also you can CF 300 series cards with their equivalent 200 series ones since they use the same GPU (290x and 390x, 290 and 390, 285 and 380, etc)

Yes, but not worth it. The 390s extra OC and VRAM will be unutilized.

[-rascal-]

It has to be the same Model no.

It can be done like R9 290 with R9 290. But it doesn't matter which brand they are coming from. But the Higher speed's clock speed will be

lowered down to match the lower speed one.

But not like R9 290 with R9 280.

It is not necessary for the Core and Memory frequencies to be indetical, but it is recommended for optimal performance.

The GPUs are capable of operating with asynchronous frequencies.

An example are my two HD 7970's. One operates at 1050 MHz Core, and 1500 MHz Memory. The second card operates at 925 MHz Core, and 1375 MHz Memory. Sapphire's TriXX software even has an option to either synchronize the GPU frequencies, or not.

As for which cards can be Crossfired together, it depends on the GPU Core used. As long as the cards use the same Core chip, you can Crossfire them together.

Example:

HD 7970, 7990, R9-280X all use the "Tahiti XT" chip.

HD 7950, and R9-280 use a cut down version of the "Tahiti XT."

You can Crossfire with any of the listed cards.

7970 + 7950

280X + 7970

7950 + 280

7970 + 7970

Etc.