Can i crossfire my r9 390x with my old r9 270x ? i read here

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jimmyEatWord

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You Can Pair an R9 300 Series GPU with an R9 200 in CrossFire


http://www.techpowerup.com/214259/you-can-pair-an-r9-300-series-gpu-with-an-r9-200-in-crossfire



With AMD unifying the driver between the R9 300 series and the older R9 200 series GPUs, it's now possible to pair a Radeon R9 300 series graphics card with one based on a similar-spec chip from the R9 200 series. At launch, the R9 300 series and R9 Fury series had a separate driver branch from the remaining lineup, which was unified with Catalyst 15.7 WHQL. Now, you may pair an R9 390 or R9 390X, with an R9 290 or R9 290X.

You may even create a 4-way CrossFire setup with one each of the four cards. You should even be able to combine R9 380 with R9 285. AMD allowed similar cross-generation pairings in the past, such as those between the R9 280 series and HD 7900 series, and between the R9 270 series and HD 7800 series. The company's newer GPUs feature XDMA CrossFire, which does away with bridge cables, for increased flexibility.




So does it have to be a 290x or could it also be a 270x ?!

my new r9 390x doesn't even have a place for a crossfire bridge , they're both asus
 
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jossrik


As far as I know, there isn't a way to enable your system to make use of both cards. Again, YOU CANNOT CROSSFIRE those cards. DirectX12 merely makes use of available resources, and the game has to be programmed to do that, just because it's DirectX12 doesn't mean it will make use of all available GPU resources. Plug your main card in without the secondary, run a benchmark in Doom (not sure if you can or not, I don't like FPS games), anyhow...
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jossrik

jossrik

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Second on that, those are different chips all together. What it means is that a 390(x) can pair with a 290(x), all four of the cards in this example have the same graphics chip in them and can all work together. Now, if you bought a 370(x), that would likely crossfire with the 270(x). As was also said, Dx12 will somewhat change this, but for that to work the game has to be programmed to accept both graphics cards to work, so any game that you're currently playing is likely not going to support Dx12.
 
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jimmyEatWord

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i'm playing DooM witch supports direct x 12 , so should i configure the crossfire in crimson or in the direct x ? wherever the heck is the direct x even located ? can you help me with this please , thank you
 
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jimmyEatWord

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what should i do with the directx thing? is it embedded in crimson ? cause i only see directx when i install my steam games
 
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jossrik

jossrik

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As far as I know, there isn't a way to enable your system to make use of both cards. Again, YOU CANNOT CROSSFIRE those cards. DirectX12 merely makes use of available resources, and the game has to be programmed to do that, just because it's DirectX12 doesn't mean it will make use of all available GPU resources. Plug your main card in without the secondary, run a benchmark in Doom (not sure if you can or not, I don't like FPS games), anyhow, if you can, run a benchmark, then power down, install the second card, install the latest drivers, then run the bench again. Past that, we're into territory that I have little knowledge of, whenever I crossfire or SLI I try to use the exact same cards, with crossfire, if you could, it would down your more powerful card to the same lvl as your weakest card, making crossfire of different cards a waste of resources.
 
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