Do i have enough power???

You have enough power to have three GTX 470s in your system:

http://www.guru3d.com/articles_pages/geforce_gtx_470_2_and_3_way_sli_review,23.html

With just one GTX 470 under full load in their system, their power supply pulled 411W from the wall outlet.  The CPU was idling, so let's add 150W, which makes the power supply pull 561W from the wall outlet.  If the PSU is 85% efficient while pulling 561W from the wall, then that means the system is pulling about 477W from the PSU.  This power draw of 477W is with both the GTX 470 and the CPU under full load simultaneously.

With two GTX 470s and the CPU under full load simultaneously, the power draw from the PSU would be 610W.

With three GTX 470s and the CPU under full load simultaneously, it would be about 802W.

Your PSU is designed to be able to deliver 850W continuously.  ;)

Quote:

Originally Posted by DNytAftr 

should be more then enough of my systems is using 3 gtx 470s and draws a bit more then 900 watts from the wall, (907 i think it was?) so more then fine

That sounds about right because if your PSU is 90% efficient while pulling 907W from the wall, then that would mean your system pulls 816W from the PSU when the PSU pulls 907W from the wall.

Quote:

Originally Posted by Agusta0750 

I am running 8 hard drives two, how much strain does that add?

Anywhere from about 5 to 9W per hard drive, depending on how much work the hard drive is doing:

http://www.tomshardware.com/reviews/4tb-3tb-hdd,3183-15.html

(I am assuming that this can give a general idea that can be applied to most hard drives)

So, if you were to make all 8 hard drives completely maxed out to their limits, then the total amount of power being consumed would probably come to 60-80W.  I have to assume that this never happens, so the maximum amount of power all 8 of your hard drives consume at any given time probably doesn't even ever exceed 50W - if that.

Quote:

Originally Posted by Agusta0750 

The eXtreme Power Supply Calculator Pro said at 20% capasitor aging i will be pulling 849w.

But 20% capacitor aging is unrealistic unless your PSU has been under full load 24/7 for the past few years.  A more realistic figure is about 5-10%, but the problem is that you have a quality-made power supply, so this isn't that much of an issue.

Not only that, but the "System Load" in this PSU calculator must be set to about 70% or so unless you are Folding or BOINC'ing 24/7.

So, can you use the calculator again?  Except, this time click the calculator's built-in Print button and then post a screenshot of that page in your browser.  I want to show you what the PSU experts on here taught me regarding how to use this calculator correctly so that you don't get extremely over-inflated results like 849W.

Quote:

Originally Posted by Agusta0750 

Also at 120v input from my wall outlet the psu only gets around 88% efficiancy wich gives me only 749 true wattage.

The efficiency works like this:  if your system needs 600W, and if your PSU is 90% efficient, then it has to pull about 667W from the wall outlet in order to deliver 600W to the system.  If the PSU is 85% efficient, then it has to pull about 706W from the wall outlet in order to deliver that 600W to the system.  If the PSU is only 80% efficient, then it has to pull 750W from the wall in order to deliver 600W to the system.

So, the efficiency isn't related to the PSU's capacity at all.  Your PSU can continuously deliver 850W because that's how it has been designed.  It is a quality-made 850W power supply.  The efficiency doesn't enter into the capacity rating at all.  In other words, you do not have a 765W power supply because it can be about 90% efficient, nor do you have a 748W power supply because of this assumed 88% efficiency.

Quote:

Originally Posted by Agusta0750 

and what about the power in my house, my outlet is running on a 15 amp circut, in wich my psu pulls 11 amps.
So lets say i am pulling another 8 amps off the line with lights, tv and other such things. now the psu isn't getting enough amps.
How much does that effect the life and performance of my psu?
I am considering adding a dedicated 20 amp circuit for my computer.

I don't know, but why are you asking?  Are you having computer problems?  If not, then everything is fine.