Supplementary PSU and SLI GFX

[puritania406]

Hi
I'm in a little bit of a situation..
My Mushkin 800w PSU is now dead.. I cannot refund it so I'm getting a replacement. Now, I have two GeForce GTX 260's running in SLI. I found out I was trying to push moe power than I had. I thought 800 watts was enough, but apparently not. Since I can't refund and get a higher wattage, I was looking into this..

http://www.newegg.com/Product/Product.aspx?Item=N82E16817104054

Could that run my two 260's well enough? That's the only supplementary PSU I've been able to really find.

Thank you.

 

[delluser1]

Is this your Mushkin ?

That's plenty for a pair of 260's.

 

[puritania406]

Yes it is. I would also assume it was enough power..
But with 4 hdds, a burner, 2 260's, a dual core, 7 fans.. it fried.
I was told that its not enough power for my system under load.

 

[jsc]

Whoever told you that was wrong.

My power estimates (keep in mind that the 12 volt rails do all the heavy lifting):
OC'd C2D - 8 amps
GTX260 - 10 amps each
4 HD's & an optical - 5 amps @ 12 volts, 5 amps @ 5 volts
MB logic, no more than 5 amps @ 5 volts, 1 amp @ 12 volts
Mem - 12 amps @ 3.3 volts - if you have 8 GB of RAM
8 fans - 2 amps @ 12 volts

Many of these are high side estimates. Total is:
34 amps @ 12 volts, 10 amps @ 5 volts, 12 amps @ 3.3 volts.

Total wattage = 498 watts. Even if I were 20% low, :lol: that's still only 600 watts.

Assuming a working PSU, you have plenty of power available.

 

[puritania406]

Huh. Ok, well thanks for the info. So I really shouldn't need an extra psu.

So assuming my PSU had no issues when it was working, in my system, what causes a blown capacitor?

And now that I'm getting it replaced, what are the chances/causes that my mobo will fry, and my PSU will fry again?

 

[JohnnyLucky]

^5 +1 what DellUser1 and jsc said.

drum roll please.......

The general rule of thumb is a high quality 500 to 550 watt power supply with sufficient current (amps) on the 12 volt rail(s) can easily power a system with any single video card made. A high quality 700 to 750 watt power supply with sufficient current (amps) on the 12 volt rail(s) can power a system with two video cards operating in dual mode. There are a few exceptions like the new ATI Radeon HD 5XXX series cards which use less power due to their energy efficiency.

A high quality 500 to 550 watt psu will have a +12 volt rail rated at 40 amps. A high quality 700 to 750 watt psu will have a +12 volt rail rated at 60 amps.

Corsair, PC Power & Cooling, and Seasonic are some of the brands that have a reputation for high quality power supplies that consistently earn high marks in technical reviews. They are reliable, stable, and come with a 5 year warranty. Some of the newer models come with a 7 year warranty. Lately we've been seeing a few other brands offering some high quality units. An example would be the Antec Earthwatts series which is an improvement over Antec’s older series psu’s.

FTR - I checked a few technical references. Mushkin is not known for high quality power supplies.....

 

[puritania406]

Alright thanks much for the help.