Most accurate PSU calculator out there?

Those two calculators are identical.

I don't recommend calculators, but instead I recommend asking the PSU experts on here.

I'm not one of them, but I will say that if you have the plain GX (as opposed to the GX Bronze Series), then I wouldn't be a bit surprised if it is at its limit even though you only have two GTX 680s in your system.  I mean, a quality 750W PSU (as opposed to the plain GX series) would have enough power for your system with three GTX 680s:

http://www.guru3d.com/articles_pages/geforce_gtx_680_3_way_sli_review,4.html

With three GTX 680s in SLi under full load, their system pulled about 550W from the PSU (649W from the wall).  The CPU was idling, so let's just add 200W to their "at the wall" power draw which was 649W.  That makes 849W which would make the system pull about 721W from the PSU at the most.

For two GTX 680s, all of those calculations would come out to be about 572W being pulled from the PSU at the most (or 575W to round it up).

I will say here that I've heard nothing but bad things about the plain GX series, so I would replace it if that's what you have.

Quote:

Originally Posted by sonarctica 

Ok, cause you see the specs i my signature, and with those the pc works just tine at mostly full load, but when i add my fourth hdd, then the motherboards safe mode comes in...
Till im gettin the money to buy a new psu, which psu could you guys recommend from this site?
(atleast 1000w, cause im soon goin to have 8 storage drives in my pc (2x ssd in raid for OS and 2x caviar black in raid 0 for gaming)and 4 for storage and later another third 460 which my brother borrows atm which im goin to have as physx engine (cannot have tripple sli cause then i have to use the third 680 in an pci-e 2.0 slot))
http://www.komplett.no/k/kl.aspx?mfr=&bn=10061&sortBy=p&zbo2=true&filter=A00526.700-1199.

All that would be needed is a quality 750W power supply.

Do you have the GX Bronze, or the plain GX series?

The GX Bronze series is a decent quality line while the plain GX is, from what I understand, junk.

Quote:

Originally Posted by sonarctica 

Lol, seems like the psu was the problem..
http://www.komplett.no/k/ki.aspx?sku=593204
That is the one i have, so as long as i choose lets say an 850W gold psu, it should use the watts im actually paid for?

The efficiency refers to how much power is lost as heat.  So, it doesn't have anything to do with how much power it can deliver.

Check out this review of the PSU you have:

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story&reid=188

It is basically a "decent 600W unit":

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story5&reid=188 (the last page)

This isn't because it's just an 80+ instead of 80+ Gold, but it's just that it's not a very good power supply.

All that your system needs is a quality 750W power supply at the most:

http://www.guru3d.com/articles_pages/geforce_gtx_680_3_way_sli_review,4.html

With three GTX 680s in their system under full load, their system caused their PSU to pull 649W from the wall outlet.  The CPU was idling, so let's add 200W and then let's assume the PSU is 85% efficient.  So, if the PSU is 85% efficient while pulling 849W from the wall, then that would mean the system is pulling about 721W from the PSU.