Good morning Ray, Sorry to be so late about answering your last question. I have been out to West Texas doing a job for my company, and am just getting back home. The Pentium 4 system uses the two connections for getting advanced instructions to and from the ATX power supply. At this time I do not know how much more control the Pentium 4 system has over the ATX power supply than the other standard systems. Hope this partally answers your last question. Thanks, Jim Dodd Mineral Wells, Texas US The NOSPIN Group Promotions is now offering Mandrake Linux or Red Hat Linux CD sets along with our NOSPIN Power Linux CD... at a great price!!! http://freepctech.com/goodies/promotions.shtml