https://community.hpe.com/t5/proliant-servers-netservers/multi-processors/m-p/431443#M6334 Graham:<BR /><BR />First, Windows 2000 Profesional will only recognise 2 processors. You need to use Windows 2000 Server to utilize all 4 processors.<BR /><A href="http://www.microsoft.com/windows2000/professional/evaluation/sysreqs/default.asp" target="_blank" rel="nofollow">http://www.microsoft.com/windows2000/professional/evaluation/sysreqs/default.asp</A><BR /><BR />Second, make sure each processor pair is matches with a processor of the same speed and cache size. Mon, 27 Sep 2004 08:32:08 GMT CA859951 2004-09-27T08:32:08Z https://community.hpe.com/t5/proliant-servers-netservers/multi-processors/m-p/431442#M6333 Hi,<BR /> <BR /> I'm running a Proliant 6500 with 2 x 200 Mhz 512k cache processors and have just added another 2 processors (same speed) but with 1Mb cache each. Windows 2000 Pro is failing to recognise them even after updating the system via the Control Panel. Will this system work or am I wasting my time by having different sizes of cache on the processors ?<BR /> <BR /> Many thanks,<BR /> <BR /> Graham Mon, 27 Sep 2004 04:57:46 GMT https://community.hpe.com/t5/proliant-servers-netservers/multi-processors/m-p/431442#M6333 Graham Stokes 2004-09-27T04:57:46Z https://community.hpe.com/t5/proliant-servers-netservers/multi-processors/m-p/431443#M6334 Graham:<BR /><BR />First, Windows 2000 Profesional will only recognise 2 processors. You need to use Windows 2000 Server to utilize all 4 processors.<BR /><A href="http://www.microsoft.com/windows2000/professional/evaluation/sysreqs/default.asp" target="_blank" rel="nofollow">http://www.microsoft.com/windows2000/professional/evaluation/sysreqs/default.asp</A><BR /><BR />Second, make sure each processor pair is matches with a processor of the same speed and cache size. Mon, 27 Sep 2004 08:32:08 GMT https://community.hpe.com/t5/proliant-servers-netservers/multi-processors/m-p/431443#M6334 CA859951 2004-09-27T08:32:08Z