AMD's phenom quad-core processor had a rough launch, but its second-generation Phenom X4 chips now run at their full potential. At the top of the line is the Phenom X4 9850 Black Edition, which has an unlocked multiplier for more over-clocking flexibility. At stock speeds, this quad-core chip runs at 2.5GHz, with 2GHz Hypertransport and memory clocks.
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