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Adding Second Intell CPU

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I have a dual processor capable motherboard. I currently have a single 400 MHz PII installed running windows 98. I plan to replace 98 with NT Server using my current hardware setup (one CPU).
I plan to add a second PII 400 MHz after NT is installed. Will NT Server recognize the second CPU after it is installed or are there any changes to the registry that need to be made?

I was shopping for the PII today and the sales person said that both CPU’s must have the same batch # or there will be problems. He went on to say that adding a second CPU to NT that has a different batch # will work but there will be performance problems. Please advise me on this one because I do not think it is necessary to have to buy two processors at once when you can upgrade you server later when it needs it.
Thank you
Jim Conner

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Adding Second Intell CPU

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The processors do not need to be from the same batch. For complete information from Microsoft on multiple processor support, see technet article Q156358 on manually adding multiprocessor support. You should also be able to find this on Microsoft’s website at http://support.microsoft.com/support/kb/articles/Q156/3/58.asp

Adding Second Intell CPU

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When moving from a single CPU to dual CPU’s, you must install multiprocessor versions of a number of NT files, including the HAL and the OS kernel. THe UPTOMP.EXE utility, contained in the NT Resource Kits, Installs the multiprocessor files. The files can be installed manually (see MS knowledge Base Articles Q156358, “How to Manually Add Support for a second processor,” and Q168132, “After Applying service Pack NT reports single processor”).
The MS knowledge base article Q142660, “Upgrade from Uni- to Multi- Processor (Uptomp.exe) and Win32k.sys,” describes a known problem that occurs when UPTOMP.EXE is used on a version 4.0 NT system. The fix described in the article is to add the following line to the file UPTOMP.INF,located at the base directory of the Resource Kit installation (reskit):
win32k.sys=0, 2, win32k.sys

Finally, if you install the mutiporcessor files on a system wo which a service pack has been applied, you probably need to reapply the service pack after runningUPTOMP.EXE (see next

Adding Second Intell CPU

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part 2….and before rebooting. Until you repply the service pack, your disk contains a mix of file versions, with the multiprocessor files at the revision level of the distribution media and files already present at the service pack revision level.Such a mix of versions can cause your reboot to fail.
For Compaq Proliant servers, Compaq has provided a very automated method of changing the HAL that does not require the NT RES Kit and is distributed on the Compaq SmartStart CD. LMK
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You have two good answers 1 & 2, However from experience I have found it much easier to install the second processor first, before you install NT (it should pick it up during the installation).

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