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Also X2 had higher clocks per GPU too.
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Negative. Clocks were same.
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But its really dissapointing to see 4890's performance...only slightly better than 4870. And shader count is the same.
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HD4890 has 3 million transistors more than HD4870.
And with Core Clock of 950MHz and Memory Clock of 1100MHz(4400MHz effective), the card beats the HD4870 by a wide 15-25% margin.