on the port web-page there was a question as to the differences between the three versions of the Mips R4x00 series as used in SGI machines. The differences are: 4x00PC only the on chip 32kb cache(16D, 16I), ie Primary Cache 4x00SC off chip(but on the daughtercard) Secondary Cache, 1Mb unified 4x00MC-o clue Aaron -- Aaron Macks(aaronm@cs.brandeis.edu) My sheep has seven gall bladders, that makes me the King of the Universe!