to fill the sales channels, and to ensure that the Macintosh Processor Upgrade Card would be available at the same time. This was a departure from prior practice at Apple; they had typically released upgrade packages months after the introduction of new Macintoshes. The Power Macintosh was formally introduced at the Lincoln Center for the Performing Arts in Manhattan on March 14. Pre-orders for the new Power Macintosh models were brisk, with an announced 150,000 machines already having been sold by that date. MacWorld's review of the 6100/60 noted that "Not only has Apple finally regained the performance lead it lost about eight years ago when PCs appeared using Intel's 80386 CPU, but it has pushed far ahead." Performance of 680x0 software is slower due to the emulation layer, but MacWorld's benchmarks showed noticeably faster CPU, disk, video and floating point performance than the Quadra 610 it replaced. By January 1995, Apple had sold 1 million Power Macintosh systems. Speed-bumped versions of the Power Macintosh line were introduced at the beginning of 1995, followed in April by the first PowerPC 603 models: an all-in-one model called the Power Macintosh 5200 LC and a replacement for the Quadra 630 called the Power Macintosh 6200. Performa variants of these machines were sold as well, continuing the practice of re-branding other Macintosh models for sale in department stores and big-box electronics retailers. While the 5200 LC was well-received by critics for its design, performance, and cost, both it and the 6200 suffered from stability issues (and in the case of the 5200, display issues as well) that could only be solved by bringing the machine to an Apple dealer for replacement parts. By mid-1995, the burgeoning Power Macintosh line had all but completely supplanted every prior Macintosh line, with only the high-end Quadra 950 and two low-cost education models (the all-in-one Macintosh LC 580 and desktop LC 630) remaining in production. The competitive marketplace for "accelerator cards" that had existed for earlier Macintosh systems largely disappeared due to the comparatively low price of Apple's Macintosh Processor Upgrade Card (US$600). DayStar Digital sold upgrade cards for the IIci and various Quadra models, and full motherboard replacements were available from Apple as well. Macintosh clones from companies like DayStar Digital and Power Computing were also coming to the market at this time, undercutting Apple's prices. Transition to standardized hardware (1995–1999) When the Power Macintosh was