Need some power supply advice

[jaguarmatt]

I wanted to start a Crossfire build, so I picked up a used Silver Stone.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817163108&cm_re=SilverStone_Zeus-_-17-163-108-_-Product

I paid $40 for it since it was EXTREMELY loud and ran hot.

I ditched the fan and put in my own 80mm Dynex as an INTAKE fan instead of an exhaust. (Good idea?)
I also took off the top/side panels so it's pretty much just the bottom piece. I'm using my GTX 460 as an external exhaust. (my card runs very cool)
This PSU fits very snugly in my M-ATX build. xD

It now runs extremely cool and runs my build perfectly right now, but I want to know if it can handle a Crossfire setup.

I was thinking about doing 2 HD5850's since they're only $170 new right now.
This is a good PSU, right? I know the brand but I'm not familiar with this model.
The inside of it is extremely nice, I cleaned it up a bit and changed the fan adapter that was inside of it.


Did I get a good deal on this & will it run dual 5850's?

Thanks for reading and happy holidays,

- Matt

 

[4745454b]

Seeing as you took the casing apart I doubt it matters what way the fan blows. Its not about the number of fans, but how the air flows through the case. Its now just an open area, so there is probably a lot less flow.

I did the math, you have 42A on the 12V rail. Isn't the 5850 a 200W part? (might be 175W) You'll need 350W to 400W for the GPUs alone. What CPU do you have? You didn't state so lets assume one that's close to 100W. Toss in another 50W for the board and other devices and this means you need around 550W on the 12V rail. 42A x 12V = 504W.

Silverstone makes some good PSUs, but I'm not familiar with that line. I don't think I would try for a 5850 CF setup because you'll be asking to much from that PSU. You should be able to CF a couple of 6850s however. Probably wouldn't be that much slower either.

 

[Niklas_13]

http://www.guru3d.com/article/radeon-hd-5850-review-crossfire/9

 

[jaguarmatt]

The flow is actually a lot better, if you look at the pictues on newegg the psu case has VERY little airflow.

I was kinda hoping to do 5850's since they're cheaper and still more powerful.

My processor uses about 150 watts lol.

 

[4745454b]

151, you would think I could remember that number....

I forgot to mention that two of those cards would need four 6pin plugs, and you only have 3. Add in that that link says you need 55+A on the 12V rail, I'll stand by my answer of bad idea.

 

[Niklas_13]

The flow is actually a lot better, if you look at the pictues on newegg the psu case has VERY little airflow.

I was kinda hoping to do 5850's since they're cheaper and still more powerful.

My processor uses about 150 watts lol.

Your looking @ a 750W PSU to xfire HD 5850s you need 55 to 60 A on the 12v rails

 

[jaguarmatt]

http://www.guru3d.com/article/radeon-hd-5850-review-crossfire/9

Good link, thanks.


@ 4745454b
I have 5 6-pin plugs lol.

I guess I'll just sell this psu then, thanks for your help, both of you.

 

[jaguarmatt]

Best answer selected by jaguarmatt.

 

[4745454b]

5? I could have sworn the newegg link said it came with 3.

 

[Niklas_13]

I have a Corsair 750W PSU and a HD 5850, if your in SoCal

 

[jaguarmatt]

5? I could have sworn the newegg link said it came with 3.

That is what the link says, but I counted 5. xD

2x2 and 1 by iteself.

 

[Niklas_13]

5? I could have sworn the newegg link said it came with 3.

PCI-E 3 i seen

 

[jaguarmatt]

I have a Corsair 750W PSU and a HD 5850, if your in SoCal

3,000 miles away. D;

 

[Niklas_13]

3,000 miles away. D;

shipping NOT worth it.

 

[jaguarmatt]

shipping NOT worth it.

Flat rate box ftw. xD


Thank you both and happy holidays!

 

[Maziar]

This topic has been closed by Maziar