Excuse me for the delay...
MS-6541 Motherboard: CPU SUPPORT with BIOS 3.18 (12 Jun 2003)
Bios available here:
http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareDescription.jsp?lang=en&cc=us&prodTypeId=12454&prodSeriesId=316603&swItem=PSG_I18339-101534&prodNameId=316605&swEnvOID=1093&swLang=13&taskId=135&mode=4&idx=1
SL7EY 2.80 GHz BUS 400 MHz 0.13 micron D1 512 KB 478 pin
SL6PP 2.60 GHz BUS 400 MHz 0.13 micron D1 512 KB 478 pin
SL6QR 2.60 GHz BUS 400 MHz 0.13 micron D1 512 KB 478 pin
SL6PN 2.50 GHz BUS 400 MHz 0.13 micron D1 512 KB 478 pin
SL6QQ 2.50 GHz BUS 400 MHz 0.13 micron D1 512 KB 478 pin
SL6PM 2.40 GHz BUS 400 MHz 0.13 micron D1 512 KB 478 pin
SL6QP 2.40 GHz BUS 400 MHz 0.13 micron D1 512 KB 478 pin
SL6QN 2.20 GHz BUS 400 MHz 0.13 micron D1 512 KB 478 pin
SL6PL 2.20 GHz BUS 400 MHz 0.13 micron D1 512 KB 478 pin
SL6QM 2.00 GHz BUS 400 MHz 0.13 micron D1 512 KB 478 pin
SL6PK 2.00 GHz BUS 400 MHz 0.13 micron D1 512 KB 478 pin
SL6PQ 1.80 GHz BUS 400 MHz 0.13 micron D1 512 KB 478 pin
SL6PG 3.06 GHz BUS 533 MHz 0.13 micron D1 512 KB 478 pin
SL6QC 3.06 GHz BUS 533 MHz 0.13 micron D1 512 KB 478 pin
SL6QB 2.80 GHz BUS 533 MHz 0.13 micron D1 512 KB 478 pin
SL6PF 2.80 GHz BUS 533 MHz 0.13 micron D1 512 KB 478 pin
SL6QA 2.66 GHz BUS 533 MHz 0.13 micron D1 512 KB 478 pin
SL6PE 2.66 GHz BUS 533 MHz 0.13 micron D1 512 KB 478 pin
SL6PD 2.53 GHz BUS 533 MHz 0.13 micron D1 512 KB 478 pin
SL6Q9 2.53 GHz BUS 533 MHz 0.13 micron D1 512 KB 478 pin
SL6PC 2.40 GHz BUS 533 MHz 0.13 micron D1 512 KB 478 pin
SL6Q8 2.40 GHz BUS 533 MHz 0.13 micron D1 512 KB 478 pin
SL6PB 2.26 GHz BUS 533 MHz 0.13 micron D1 512 KB 478 pin
SL6Q7 2.26 GHz BUS 533 MHz 0.13 micron D1 512 KB 478 pin
Bene ora sono pronto per l'upgrade...