New motherboard + Need help.

Hi I'm new in here.
Need help with some questions about this motherboard.

Got this motherboard ASUS P5N72-T Premium of a friend, he got a new one back from support + the old one apparently working again.

Don't know much about computers, so please :) these are perhaps some stupid questions.

1). Can I just take the motherboard out and put the new in, just so?
2). Do i need to put bios to default settings before I do it (no OC)??
3). Am i going to format the HDD again, or can they run as nothing happen???
4). The reason for the new motherboard is because I have an extra XFX 8800 GT in my possession and was thinking about running sli.
5). The final question, will i fell that i got 2 gpu's and can my psu handle it? 38A overall +12V rails or do i need new psu?

Maybe this is an old computer, but got no money to spare right now.

PC Specs
ASUS P5B Deluxe
XFX 8800 GT
Corsair Twin 2X2048-6400
Thermaltake 680 Watt
Intel Core 2 Duo E6600 OC 3.33 Ghz
Scythe Infinity
1xWD Raptor 360ADFD
2xWD Caviar SE16 2500KS
Multi-boot: Windows XP Pro SP3, Windows 7 Pro.
! Not I who did the OC !
2 answers Last reply
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  1. 1. Yes.
    2. You should.
    3. You won't need to format the drive, but you probably will need to reinstall Windows.
    4. OK.
    5. Your PSU should be adequate. A pair of 8800GT's need about 15 amps. Add another 8 amps for your CPU. That gives you more than 15 amps for the rest of the system.

    However, I would put in a better PSU. 38 amps for a 680 watt PSU is kind of weak. A 550 watt Corsair produces 41 amps and a 650 watt Corsair produces 52 amps at 12 volts.
  2. "However, I would put in a better PSU."

    Whats it matter, if it can handle the system why get rid of it? Or are those PSUs junk or something...
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