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crossfirex 5830 & 5850? - Page 2

post #11 of 20
Quote:
Originally Posted by Phr33d0m View Post
So I should connect my monitor to the 5850? Or that's not important?

Also I've tried to calculate the PSU I'd need with different tools and here are the results:
1. First says I'd need 440~510W
2. Second says (the newegg one) I'd need: 740W
Can someone help me with the watts as I'm not sure that I'd be able to buy a new PSU too.
It doesn't matter which one you connect your monitor too. And about your PSU, I don't know the quality of it, but I was once upon a time running my rig on a 650w Antec. So it's not impossible if your psu is a good quality one.

And Master Chief gets it. The 5850 won't downclock. It will, in fact, run at it's own speed so you should expect CF to be better with it than with 2 5830's. It should fall between CF 5830 and CF 5850. Let's call it CF 5840 speeds. I actually ran this test myself back in the 4800 days with a 4850 and a 4830.
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post #12 of 20
Thread Starter 
I was lurking around and I might go with a two-PSU setup. So I might see no problem with the PSU.
    
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post #13 of 20
Here is the thing. Even-though HD 5850 will remain the same specs performance will be same as HD 5830 CF. As far as i know HD 5830 CF can barely beat HD 5870 and HD 5850 OCed can probably be faster then HD 5830 CF.
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post #14 of 20
Quote:
Originally Posted by The Master Chief View Post
No, they will each run at their rated speeds.
Quote:
Originally Posted by The Master Chief View Post
Ever since the 3800 series, each card will run at there own clock speeds.


Thus, the 5850 will run like a 5850, and the 5830... well a 5830.
This man speaks the truth. I have run 4850+4850 Crossfire and 4850+4890 Crossfire and 4890+4890 Crossfire and the 4850+4890 was faster than 2x 4850s by a decent amount but slower than 2x 4890s.
post #15 of 20
Dual PSUs are a waste of time and money except in very, very, very limited circumstances (which you don't fall under).
post #16 of 20
Thread Starter 
Quote:
Originally Posted by Phaedrus2129 View Post
Dual PSUs are a waste of time and money except in very, very, very limited circumstances (which you don't fall under).
I'm interested what you mean by that "time and money"?

If I have to buy another PSU (minimum 750W or 800W) it will cost me hell more (a good one is at minimum 120 euros, and even more). But if I buy a decent 300-400 (even cheap 500W LOW PERFORMANCE) is still a lot cheaper (25~35 euros on my local store).

So, could you explain what you meant?
Thanks.
    
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post #17 of 20
I think he means it would just be more logical and easier if you slightly upgraded your current PSU, as it will save you much time and hassle then trying to do a dual PSU setup (which isn't even needed in the first place).

not to mention down the road it will save you money and just perform much better. I ran 2 5850's and an overclocked 1055T at 4.0 with a 750w PSU.
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post #18 of 20
Thread Starter 
I'm more than sure I'll need +600W.
Btw, the two-PSU job is done in exactly 0.3 min.
    
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post #19 of 20
Actually a decent 550W could probably handle it. Decent being the key word. I don't know what's available in your area, but I can tell you that crossloading a cheap, crappy group-regulated PSU because there's no load on the +5V and +3.3V is a good way to wreck the graphics cards hooked up to it.
post #20 of 20
i think that if he cf those 2 cards he will need 1 psu 650-700w... thats my opinion...
mounting 2 psu.. not good idea...
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