Not everyone is in to hardware like I am so I figured I should make the "stepping" subject clear. Stepping is the microcode version of the processor. A dual (or greater processor) system "MUST" have processors of the same stepping or they will not work properly ("or at all"). On the PII 400mhz processors... Have a bracket on the front side of the processor that holds the heat sync in place. I don't know who designed the bracket but they should have been taken out and beaten with a wet noodle! The bracket covered the stepping number, _only the stepping number_ >:o Thats why I didn't want to look for the stepping number in the first place. Heat sync grease and all that. I had a request for a dual processor upgrade. I had to remove the bracket (bracket only) that holds the heat sync to get the stepping off the S.E.C.C.2 400mhz processors. I Looked up the stepping on the Intel site. FYI http://search.intel.com/support/search.asp?q1=stepping&SearchCrit=ALL&selFamily=24%23%240&selLine=All&recsPerPage=25&category=support&hidProductName=All+Processors+Products&hidProductAlias=prd24&mh=200&Family=1&Line=All&hidProductIndex=-1&source=http%3A%2F%2Fsearch.intel.com%2Fsupport%2Fsearch.asp&version=2.0&ICrit=undefined&IRecs=1&FamFilter= The PII comes in 2 packages. The S.E.C.C. and the S.E.C.C.2 <Thank the great Linux master in the sky Intel put pictures on the web. > The S.E.C.C. has a fully surrounded slot connector The S.E.C.C.2 has a partially surrounded slot connector *For the 400mhz processors, 100mhz bus* S.E.C.C.2 stepping SL357 = 7 processors S.E.C.C. stepping SL2U6 = 2 processors S.E.C.C. stepping SL257 = 1 processor *For the 233mhz processors , 66mhz bus* S.E.C.C. stepping SL2HD = 2 processors S.E.C.C. stepping SL2HF = 1 processor Sam. _______________________________________________ TCLUG Mailing List - Minneapolis/St. Paul, Minnesota http://www.mn-linux.org tclug-list at mn-linux.org https://mailman.real-time.com/mailman/listinfo/tclug-list