Need some advice for my first rig

[ltcnim]

hi,

I'm currently planning on buying my first scrypt mining rig, and need some tips with the hardware. so far, I have the following components in mind:

ASRock 970 Extreme4, Mainboard
AMD Sempron 145 AM3
G.Skill DIMM 4 GB DDR3-1600
3 x SAPPHIRE Radeon HD 7950

OS: BAMT from USB stick

alright, and here are my questions:

1. What PSU do I need? would a Xilence Gaming Series 800W PSU be enough for all three cards? Or do I need more? I was also thinking about 2 x 500WATT PSU and use them both with a dual PSU adapter cable.
2. Do I need powered risers? Or can I use normal ones?
3. Does anyone know if I can undervolt those cards with BAMT, and how much?
4. Is 1.8MH/s realistic?

Thanks in advance

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[QNX]

1. What PSU do I need? would a Xilence Gaming Series 800W PSU be enough for all three cards? Or do I need more? I was also thinking about 2 x 500WATT PSU and use them both with a dual PSU adapter cable.

it's cheaper to buy two, and you need a simple wire adapter or you can make you own dual psu switch

2. Do I need powered risers? Or can I use normal ones?

probably yes, because ASRock 970 Extreme4 don't have additional power for pcie

4. Is 1.8MH/s realistic?

yes, but if you don't plan to add more cards, it's better to get 4 or 5 R9 270 with 460-480 khs you'll get more and cheaper