Running in "Tri-Fire" with my 4850x2 is it okay? And worth it?

Okay so this will not cost me any money to do, I helped spec out a computer for a friend with little money and he gave me a 4850 card from the machine he replaced for putting the computer together for him. I currently am running a 4850x2 and my machine is already nice I run maxed out with the catalyst bells and whistles making it look even better in star wars the old republic at 100 fps so my questions is if I take the 4850 single card he gave me and run it with my 4850x2 will I see peformance gain or will it hold back my X2? I have seen way to many arguments of this on other forums so figured I would post and see what you guys have to say.
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More about running fire 4850x2 okay worth
  1. if they all have the same memory size, your psu is good enough, your motherboard can handle 3 way and your case is well ventilated i don't see any problem going to Crossfirex3 if your motherboard is compatible, you will yes gain performance over your Crossfirex2.
  2. I think (I think!) that if you run a 4850 X2 and a 4850 512MB (or 1024MB) video card, they will work together like three single 4850s and the memory would amount to 4850 X2's memory + the single 4850's memory combined.
  3. justinxtreme said:
    I think (I think!) that if you run a 4850 X2 and a 4850 512MB (or 1024MB) video card, they will work together like three single 4850s and the memory would amount to 4850 X2's memory + the single 4850's memory combined.


    crossfire/sli will work at the lowest card memory size, so if you are using 2x 2gb cards, and you add a 512mb card, all the three will be runing at 512mb, so it is kind of a waste of money, so that is why you should always match the memory sizes (matching the core clock is also best for performance but they can work with different sizes).
  4. I agree with ricardois , I would not add the other card if it has less vram than your current card.
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