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600W Crossfire ?

post #1 of 14
Thread Starter 
My freind is coming with his 5850 I was planning to try Crossfire to see what the FPS would be like.


His card is a XFX and my card is a Sapphire - I have a 600W which has 2x 6-pin connected to my card and he will have 2x 6-pin to molex.

On my PSU Box it says Multi GPU Ready, and at full load my psu can out 700W.


can I do this crossfire without blowing his card or damaging it ?
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post #2 of 14
5850 cfx is fine. Just try not to do crazy overclocking on both the CPU and GPU. Though its recommended to at least get a 650 W.

http://www.overclock.net/power-suppl...alculator.html

Awesome thread for this topic.
    
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post #3 of 14
Thread Starter 
Quote:
Originally Posted by sloppyjoe123 View Post
5850 cfx is fine. Just try not to do crazy overclocking on both the CPU and GPU. Though its recommended to at least get a 650 W.

http://www.overclock.net/power-suppl...alculator.html

Awesome thread for this topic.
well i am at 3.8 GHz with 1.5V.
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post #4 of 14
Might be pushing it abit tho. but if the PSU says that it can mantain 700W, its fine since it looks like you are going to just test the card out, not like you are going to run the 2 cards 24/7.
    
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post #5 of 14
Check phaedrus quick n dirty PSU calc, he included the Wattage stats with a hefty PC, and then you would get 650W, but if the OC is milder, you should make it easily
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post #6 of 14
Thread Starter 
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Intel i5 2500K 4.7GHz [24/7] Gigabyte Z77 ATI Radeon 6950 (XFX) Corsair Vengeance 8GB 1600MHz  
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2x 500GB HDD's [RAID 0]  A Non-Branded DVD-DL Burner Zalman CNPSX 10 Performa Windows 7 Home Premium 64 Bit 
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post #7 of 14
Quote:
Originally Posted by lukeibob View Post
You should be fine mate.
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post #8 of 14
Thread Starter 
Quote:
Originally Posted by 1337LutZ View Post
You should be fine mate.
Thanks - And if the computer wasent fine would the PSU blow or would his Graphics Card go ?
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Intel i5 2500K 4.7GHz [24/7] Gigabyte Z77 ATI Radeon 6950 (XFX) Corsair Vengeance 8GB 1600MHz  
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2x 500GB HDD's [RAID 0]  A Non-Branded DVD-DL Burner Zalman CNPSX 10 Performa Windows 7 Home Premium 64 Bit 
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post #9 of 14
NO its not fine a 600w PSU can NOT handle it , it might damage something there

yeah you need at lest a 700w or a 750w PSU so it can be safe , , you cant realy on numbers or marketing words (this 2 GPU ready)

even the thread posted about PSU calculations the 5830 CF needs at least 650w

DO NOT DO IT ON THAT 600W PSU
    
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post #10 of 14
Quote:
Originally Posted by Crag View Post
NO its not fine a 600w PSU can NOT handle it , it might damage something there

yeah you need at lest a 700w or a 750w PSU so it can be safe , , you cant realy on numbers or marketing words (this 2 GPU ready)

even the thread posted about PSU calculations the 5830 CF needs at least 650w

DO NOT DO IT ON THAT 600W PSU
While I will agree you should have a little headroom on your PSU, blindly saying it will hurt something can be (and in this case is) completely false.

First off that series of PSU is based off a Newer FSP Epsilon platform with a top rating of about 700w, that particular PSU can actually pull 700w before the OCP kicks in. If the OCP were disabled it could probably pull much more(usually you see decent PSU's such as this one pulling way higher like almost 900w before anything blows.) And don't kid yourself the StealthXtreme II line is a good set of PSU's much better then their average predecessors, and let's not forget they have the "Budget" ideal in mind. They perform so well infact very few other psu's on the market really can compete when they are sold at that price.

So let's say his wont, that his will actually blow up and kill everything at 600w or more. Well then let's look at the very worst possible power draw. Those GPU's use about 100-200w depending on how ballsy you are with a soldering gun and an ambition for a voltage mod. I doubt they'd pull 200w's on Ln2 overclocking though. Also in Phaedrus's thread these rank fairly low in their class, they aren't the monsters you make them out to be. I'd say they use about 140w-160w max after overclocking as much as you can. So that says 280w-320w's for the cards alone is fair enough. So that means he has 420w-380w's till absolute apocolypse.

Now tell me how much do you think a computer uses before you factor in your GPU's? The truth is most systems don't draw that much, I remember seeing something that the 980x's at 4.5ghz + the rest of the system were pulling like 180w from the wall alone before efficiency. That's not much.
What does all this mean? It means he's completely fine.

I respect your enthusiasm to help others but if you don't know then try not to be such and alarmist.

Oh and please read this, Gabe from Hardware Secrets always makes sure to overload the psu's to makes sure they can infact go over their rated wattage and will infact shut off before you blow them and your computer up. This one passed with flying colours reaching 888w AC at 81% effeciency before the OCP kicked in to save the day even if it probably had another 100w's under the hood.
Edited by WTHbot - 8/2/11 at 4:02am
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