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6850 xfire advice!

post #1 of 18
Thread Starter 
I just ordered 2x Sapphire HD 6850's off of Newegg for $240 and I couldn't be more happy with the purchase.
I'm waiting for them to arrive within a couple days now.

My question is will my OCQ Fatal1ty 550w PSU (80bronze) be sufficient enough to power both of those cards? There are conflicting results on google and I thought that maybe the xfire club would be able to answer with a sure answer. Surely there has to be someone out there that was or is in the same situation.

System:
i5 655k OC'd to 4.0ghz
Corsair H50 liquid cooling
Biostar Tpower i55 mobo
8GB Patriot Viper RAM (1600mhz @ 1.65v 8-9-8-24)
OCZ Fatal1ty 550w PSu


Any constructive advice would be nice. I'm on a budget so I can't just willy nilly just go out and buy a new PSU.
I've read that 6850's in Xfire will use ~430w under load. Which only leaves me 110w to power the rest of my system.
I've also ready that a quality PSU will supply more than the advertised amount, but I don't know how quality an OCZ psu is.

Thanks in advance.
post #2 of 18
550W will be enough BUT it's cutting it close like you said.
post #3 of 18
It won't be a problem with that rig. smile.gif
Quote:
Originally Posted by j4m3550n View Post

I've read that 6850's in Xfire will use ~430w under load. Which only leaves me 110w to power the rest of my system.

There's no way two 6850s will pull 430W. One tops out around 120W stock. 430W must have been total system power draw at the wall socket or something like that.
Edited by HothBase - 2/24/12 at 12:28am
 
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post #4 of 18
Thread Starter 
Thanks for the uber quick replies fellas.
I hope you guys are correct.
If it's not enough, I suppose I can put my cpu back to stock and see if that little voltage will stabilize the system.
post #5 of 18
HD 6850's are actually quite efficient at stock. The problem is that many of us here are running them at like 1000core/1200mem, so they end up consuming a bit more juice.

550W is plenty for a quality PSU. The problem is that OCZ PSUs are hit and miss. I'll be getting a Superflower as soon as I can. They are putting out better PSUs than Seasonic nowadays.
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post #6 of 18
Quote:
Originally Posted by damric View Post

HD 6850's are actually quite efficient at stock. The problem is that many of us here are running them at like 1000core/1200mem, so they end up consuming a bit more juice.
550W is plenty for a quality PSU. The problem is that OCZ PSUs are hit and miss. I'll be getting a Superflower as soon as I can. They are putting out better PSUs than Seasonic nowadays.

Still very safe I'd say. OP, see my post edit if you haven't noticed already. smile.gif
As for this particular PSU, it's on OCN's recommended list, so I'm sure it won't be an issue.
 
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post #7 of 18
Thread Starter 
Whew, I can breathe a sigh of relief now.
Now to worry about getting a darn DoA card.
Based on Newegg, Sapphire seems to be hit or miss.
This is my first time crossing into Radeon cards, I've been an nvidia fanboy all my life but at this price and benchmark results, there's no way I could turn down these 6850's!
post #8 of 18
The Sapphire cards are fine. My only complaint is the junk heatsink, fan, Fisher Price shroud (which I took off), and no memory heatsinks (added some).
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post #9 of 18
Thread Starter 
@Damric,
I have no idea how to do any of that lol. If you took off the heatsink and fan, what's keeping your card cool?
post #10 of 18
Quote:
Originally Posted by j4m3550n View Post

@Damric,
I have no idea how to do any of that lol. If you took off the heatsink and fan, what's keeping your card cool?

Oh I just removed the black plastic shrouds. They got in the way, and I get better GPU cooling with them off due to very efficient case fans. I put the heatsinks back on after I put some ram sinks on there. I had to make a couple to fit just right biggrin.gif

The saving grace of the cooler is that the heat pipes are indeed nice and fat. The aluminum parts are very shoddy though, as you will see.

Sorry this is a fuzzy pic from my phone but it's the only pic I have handy.


450
Edited by damric - 2/24/12 at 12:56am
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