3 psu choices

[ds4025]

system asrock p 67 extreme 4 gen 3 mobo, i5 3570k oc 4.4 no voltage increase. antec 1200 case 7 120 led fans, 1 big boy 220 fan, noctua dh 14 cpu cooler. 16 gigs ram at 1600, 1 500g and 1 sd hard drive. a nzxt light kit 2 meters, and 1 radeon hd 7970 oc ghz xfired with radeon r9 280x oc version. both be oced to about 1100 or so. blu ray burner and a card reader aslo. external hd here and there. I have this now:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817438017
mixed reviews on if it will be good enough. can get this or the second one If I really have to.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817438018
http://www.newegg.com/Product/Product.aspx?Item=N82E16817438010
money is a bit tight so need the best route you think I should take. I don't want the 750 psu to mess up my system if u think it way to close to being maxed out. tried psu caculators some say 650 up to 1100 watts such a big range. not sure how many total amps I would need also how many amps are supplied to all of the vga connectors. any help would be so great.

 

[Egitel]

You can't run two different video cards in Crossfire. With very few exceptions they have to be identical GPUs, with identical amounts of memory. That said, if you were going to run Crossfire with two R9 290x GPUs, then you would need at a minimum 850W, but I'd recommend going to 1,000W because dual R9 290x would use almost 800W on its own, which is pushing an 850W a little too much for my comfort levels, but that's just me. Dual 7970s would be at almost 700W.

 

[thdarkshadow]

Egital: he has a 280x and 7970 which WILL work with each other

You would need at least a good 750w to run crossfire 7970\280x. Since you want to overclock get an 850w. While you could probably get by with a 750w the power supply isn't something you want to skimp on since it can fry the whole computer if you get a bad one. I would also try to get something better than evga such as xfx, seasonic, antec or a good corsair

Here is an xfx that I would suggest:
http://www.amazon.com/XFX-Edition-Modular-Certified-P1850BBEFX/dp/B00B88Z0LM/ref=sr_1_1?ie=UTF8&qid=1397574496&sr=8-1&keywords=xfx+850w

 

[Egitel]

Egital: he has a 280x and 7970 which WILL work with each other

You would need at least a good 750w to run crossfire 7970\280x. Since you want to overclock get an 850w. While you could probably get by with a 750w the power supply isn't something you want to skimp on since it can fry the whole computer if you get a bad one. I would also try to get something better than evga such as xfx, seasonic, antec or a good corsair

Here is an xfx that I would suggest:
http://www.amazon.com/XFX-Edition-Modular-Certified-P1850BBEFX/dp/B00B88Z0LM/ref=sr_1_1?ie=UTF8&qid=1397574496&sr=8-1&keywords=xfx+850w

Misread that, thought it said 290x. My bad.

 

[ds4025]

I looked it up and said r9 series crossfire with 7000 series it wouldn't be a 290x its a 280x.

 

[Egitel]

Yeah, a 280x can Crossfire with a 7970 because they're the same GPU. I just misread it as a 290x, which wouldn't work.

 

[ds4025]

thdarkshadow thanks for the advice so a good 850 will do it then? I am not upgrading or adding anything this rig will be a good 3-4 years I hope if everything last that long in it. the 850 wont be close to max will it? I do have long gaming sessions on weekend anywhere from 6-12 hours depending on whats going on.

 

[thdarkshadow]

The xfx 850w black edition i linked will work great and last a long time. Evga PSUs while not bad are not the best for the money.