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Two AMD powered models were announced in 2009 — the 14" ProBook 6445b and the 15.6" ProBook 6545b; [35] Their Intel powered counterparts were announced three months later as the 14" ProBook 6440b and the 15.6" ProBook 6540b.; [36] and the next-year upgrade is an AMD-powered 6455b and 6555b, and Intel-based 6450b and 6550b.
Unofficially, the 440BX could often be taken to 133 MHz FSB. Enthusiast motherboards, such as the Asus P3B-F and Abit BH6/BF6/BE6 series, were equipped with BIOS options to set the board to this unofficial speed. With a 133 MHz FSB, the 440BX could even match the later i815 chipset, which was designed to accommodate the final Tualatin-core ...