Actually I believe SLA4P could have been an engineering sample or a synonym of SLAED (GO). SL9YZ (B3) was the different stepping shown on Wikipedia with different voltage range. I agree that different Stepping to GO should probably be avoided. I just do not know if SLA4P is GO or B3 Stepping.
http://cgi.ebay.com.my/INTEL-XEON-P...ms=65:3|66:2|39:1|240:1318|301:0|293:1|294:50
LA Micro seems to indicate that SLA4P is identical to SLAED and both GO Stepping.
http://cgi.ebay.com.my/INTEL-XEON-P...ms=65:3|66:2|39:1|240:1318|301:0|293:1|294:50
LA Micro seems to indicate that SLA4P is identical to SLAED and both GO Stepping.