4890 n 4830 cf

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hey i have a asus 4830 now.. m getting a HIS 4890 .... is it possile to cf both? cuz some ppl say that 4890 performance will coem down to 4830 n it will be like some 4830 cf? is that true?
 
Yes it is possible to crossfire them. The 4890 will not downclock itself. What will happen though is if your 4830 only has 512MB of RAM, then your 4890 will act like it only has 512MB of RAM. Basically, even though the 4890 has 1GB of RAM, if the other card only has 512MB then the drivers will use the greatest amount of RAM they have in common, which would be 512MB.