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How much power to feed

HEMAH
I've my computer, which I've been throwing graphics cards at.
I have a asus Maximus III Extreme, with an i7 870 clocked at 3.8 at 1.35vcore
16gb ram running way below factory 1600
2 graphics  CF 6950 that reach 1200mv core volt OC. AND plan to had 3º one.
Asus Phoebus Sonar Sound card that requires 6pin-pci-e.
1WD black 1TB, 1WD Red 3Tb, Samsung 840 250gb
1 Dvd writer
Fans : 1 230mm, 2 200mm, 2 140mm, 3 120mm (psu not included) ALL red led
 
Atm im on a corsair 850watts, I will have to upgrade my psu to be able to throw another graphics card. This one has been Very reliable for what has now been 4 years.
I would like to know how much Will I need for eventual 4 way, with external sound card added and a perhaps a pump with same config and OC (if it would be different from 3 plus sonar sound card)
Everything is pretty old at this point I guess, nonetheless It's gonne keep going with me, as I understand it must be a hungry beast 'case of the oldness if I'm not mistaken and I would really like some input.
 
Thanks in advance.

 

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I think you'll be fine with the 850W PSU, unless its faulty and such

Early 2020 Build : Intel i7 8700k // MSI Krait Z370 // Corsair LPX 8x2 16GB // Aorus 5700 XT // NZXT H500 

Early 2019 Build : Ryzen 2600X // Asus Tuff X470 // G.Skill Trident Z RGB 8x2 16GB // MSI RTX 2070 // NZXT H500 

Late 2017 Build : Intel i7 8700k // Asus Prime Z370-A // G.Skill Trident Z 8x2 16GB // EVGA GTX 1080 Ti  // NZXT S320 Elite 

Late 2015 Build : Intel i7 6700k // Asus Maximus VI Gene Z170 //  Corsair LPX 8x2 16GB // Gigabyte GTX 970 // Corsair Air 240

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@OP please highlight your text and click the remove format button on the top right. I can't read anything in Night Theme.

3 cards and costume loop. I would go with a 1000 Watts PSU just to have some headroom.

Intel 4790k | Asus Z97 Maximus VII Impact | Corsair Vengeance Pro Series 16 GB 1866Mhz | Asus Strix GTX 980 | CoolerMaster G550 |Samsung Evo 250GB | Synology DS215j (NAS) | Logitech G502 |

 

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