AMD's six-core Phenom II X6 could cost just a fraction of the price of an Intel model, mainboard producers said Thursday. The 2.8GHz 1055T and the 3.2GHz 1090T Black Edition would cost just $207 and $315 each versus the typical $999 for Intel's six-core, 3.33GHz Core i7 Extreme Edition. Both could result in six-core mainstream PCs well ahead of Intel's schedule, which may not have these options until later in the year.