Question about motherboard

I'm looking at the ASUS M4A89GTD PRO Motherboard -

I'm a total newb to building computers so i have a few questions.

1) does this motherboard support dual-channel DDR3 or just DDR3?

2) Is it possible to mix and match different memory modules? for example, say i have 2 x 4GB memory sticks and 2 x 2GB memory sticks.

3) When looking for a video card, should i look for cards that names begin with Asus to match the motherboard manufacturer? What is the difference between a "Visiontek 900300 Radeon HD 5770 Video Card" and a "Diamond 5770PE51G Radeon HD 5770 Video Card"?

4) Would it be better to buy a single upper end card, or crossfire link 2 midrange cards?
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More about question motherboard
  1. 1)Yes, the ASUS M4A89GTD PRO supports dual-channel DDR3.
    2)Yes, it's possible.
    3)No, You must look for PCIex16 graphic cards. Nowadays I would go for a HIS and SAPPHIRE.

    Here you have two good options:
    HIS H577FL1GD HD 5770 NewFan 1GB GDDR5 PCIe 2.1 DVI/HDMI/DisplayPort

    4)You can see it by yourself in this link:
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