Sonnet today introduced a 466MHz PowerPC G3 upgrade for Apple’s PowerBook 1400 series. The upgrade features 1MB of L2 cache and delivers a purported eleven-fold increase in performance over the stock 117MHz PowerPC 603e processor. The Crescendo/PB G3 466-1M is compatible with Mac OS 7.5.3 through Mac OS 9.1 and is available now for US$299.95, replacing the previous 400MHz upgrade.