Crossfire motherboard questions

Since I am fairly new to building pc's, I have what may be a simple newbie question. I plan on running crossfire (maybe not at first but certainly at some point in the near future) but am not sure what motherboard to use. I see many motherboards having 2 PCIe slots but some running x16 or dual x8 or 1 x16 and 1 x4. I've read elsewhere that using x16 and x4 degrades performance by sharing bandwidth. Which is the proper way to run crossfire, 2 x16 or 2 x8? The choice I am going with as of right now is the gigabyte 890fxa gd65. Is that a good or bad choice? Thanks in advance for the advice!
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More about crossfire motherboard questions
  1. There's no big deal difference between a 16X/16X setup and a 8X/8X setup.. 16X/4X setup will be limiting.. So if you are going for a board with Crossfire in your future plans, go for board with a 8X/8X minimum capability.. There are few low priced but good solutions available for that too such as the Asrock 870 Extreme3.. If you want to go for a 890FX chipset based motherboard then get the Asus board -
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