Encountered an issue where installing W2K3 on a HP DL385 G2 caused some funnies. When trying to ping from the server, you'd get negative ping times. I didn't think too much about it as performance was OK and this was the only noticable issue. However, it turns out that there are issues with the timing on the AMD Opteron chipsets when using 2 or more cores. Windows 2003 uses the Time System Counter for timing, and this was being affected. Adding "/usepmtimer" to the BOOT.INI fixes this problem.
Find further discussion on the problem here.
PS. it looks like it could affect VM's on Hyper-V using 2 or more AMD processors assigned to it, installed with W2K3. I've added the switch to one such VM and it *appears* to have resolved the issue
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