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SAMSUNG ELECTRONICS - ALPHA 21264B PROTO - KP21264B-0833WHN This CPU is an early engineering sample of the well-known ALPHA 21264B. Labelled "PROTO", this sample is clocked at 833 Mhz, like the first commercial 21264B, introduced in February 2001. This CPU was produced on a 0.18µm manufacturing process instead of 0.25µm for the 21264A. It comes in a 587 pins CPGA package and includes 128 KB of L1 cache for a total of 15.2 millions transistors