Power Supply questions

[Majestic5]

I am building my first gaming PC and I am a little confused on PSUs. My build will have a MSI 970 for a GPU and I want to upgrade to dual 970s in the future. The power supply I currently have on my build list is not good for SLI (I hear). I need a 750W supply and I am looking for a reliable one. Also, if I put a 750W PSU in a build that uses 350W, could that possible damage the components? I know that sounds like a ridiculous question but I am paranoid about overloads frying the components.

Build: http://pcpartpicker.com/p/K7R2Bm

 

[Suztera]

No having a higher wattage won't fry your pc. I would suggest EVGA SuperNova G2 750W or Seasonic 750W.
You could get away with it on a 650W but 750W will be enough.

 

[synphul]

No it won't damage components. In fact it will be less likely to damage them. The way a psu watt rating works, that's the power it's capable of putting out. It doesn't "force" that power to your pc, it allows your pc to draw up to that amount and will only provide what your components require. If you put a 1000w psu in a pc and your components only draw 350w, that's all it will produce. The issue is not having enough, if your components require 500w and your psu only puts out 430w then it's a problem. Even being right at the limit, pulling 475w on a 500w psu isn't ideal.

A good psu will have the ability to counter mini surges and power differences from the wall outlet to provide steady clean power to your components. They usually have overvolt protection built in. Think of wall power being kind of like a stream of water with uneven ripples in it. Quality psu's will steady all that and add protection to your components and will usually trip or shut down rather than let that rippling power flow through to your pc.

I'm not familiar with EVGA, I know Seasonic and FSP make really nice psu's.

 

[Dark Lord of Tech]

Your computer will only draw the power it needs to run , extra won't hurt at all.