I found these links\n\n[URL]http://www.roberthancock.com/dell/dell4100proc.htm[/URL]\n"...The newer Tualatin CPUs (1.13 GHz and up) will not work on these\nmachines because of the different core voltages and bus signaling\nlevels. Powerleap does have an adapter, the Neo S370/T, to allow use\nof Tualatin CPUs on older motherboards, but apparently it doesn't work\nproperly on these machines. Powerleap says that they are working on a\nnew version which may resolve this problem..."\n\n[URL]http://www.powerleap.com/Products/370T.htm[/URL]\n"..PL-370/T™ with 1.4 GHz "Tualatin"\nCeleron: 9.95.."\n\n[URL]https://www.quickbase.com/db/6v74ue7a?a=q&qid=33[/URL]\n"...Warning: After flashing to an Intel BIOS you can no longer use the\nDell Windows Cd that you received with your system. If you have a\nproblem and need to reinstall your OS, you will need to purchase a new\nversion of Windows. We apologize for any inconvenience this may\ncause, as we have just become aware of the problem. Thank a man named\nJOE for bringing this to our attention..."\n\non the last link (quickbase.com), it references having to flash the\ndell bios and the page shows the operating system as Win2000.\nI run Windows 2003 Enterprise on my Dell Dimension 4100 and wonder if\nI lose the installed OS after/if/ I flash the BIOS?