Rule for Assigning Virtual CPU Cores to Windows Servers running in ESX or ESXI

Hello Experts,
I was wondering if someone would elaborate on the general rule for assigning CPU cores to a Windows 2003 or 2008 server in VMware ESX or ESXI. I am running a host server with 1 quad core Xeon processor.  I found that a Server 2008 R2 VM I had running with SQL 2008 on it was pegging the CPU at 100% quite a bit so I added an additional core to the VM which helped.

Could someone give me their opinion on general guidelines as to how many cores to add considering different  server configurations?  Is one core sufficient in most cases?
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I've read a lot of discussion about this topic, 1 such thread is listed below. I've found 1 core to b suffice for most server setups, if you find your hitting 100% CPU usage, try adding another and see the results. I tend to steer away from adding multiple cores as I've had some issues. I just keep workload to a minimum where I can, increasing RAM instead has helped.

Hope this thread helps.

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JohnnyD74Author Commented:
Excellent post....the link gives great information...just what I was looking for. Thanks!
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