The article specifically says...

"The use of the /3GB switch from the Boot.ini file with Windows 2000 Professional or with Windows 2000 Server can give the appearance of a 3 GB...

But have you actually tried it?  According to the article  http://support.microsoft.com/default.aspx?scid=kb;en-us;291988

the OS is still reserving 2 gig, leaving only 2 gig for SQL to see.

Let me go one step further....that entire line in your table (Windows 2000 Server) should read no higher than 2 gig all the way across....

CSaalfeld

Actually, your table is wrong....SQL Enterprise on standard Windows 2000 should read 2 gig, not 4 gig.    See article http://support.microsoft.com/default.aspx?scid=kb;en-us;291988

"When the /3GB switch is used with Windows 2000 Professional...