System Clock Apparently Gaining One Second Every 45 Minutes

MacBook Pro Core Duo, OS X 10.6.8
According to the console log, the clock on my MacBook Pro seems to be gaining about a second every 45 minutes:
7/10/11 1:11:13 AM    ntpd[7969]    time reset -0.808832 s
7/10/11 1:28:31 AM    ntpd[7969]    time reset -0.774710 s
7/10/11 1:54:24 AM    ntpd[7969]    time reset -0.734610 s
7/10/11 2:11:39 AM    ntpd[7969]    time reset -0.636148 s
7/10/11 2:54:30 AM    ntpd[7969]    time reset -1.447670 s
7/10/11 3:29:31 AM    ntpd[7969]    time reset -0.869028 s
7/10/11 3:47:35 AM    ntpd[7969]    time reset -0.439925 s
7/10/11 4:13:30 AM    ntpd[7969]    time reset -1.055200 s
7/10/11 4:48:20 AM    ntpd[7969]    time reset -1.043842 s
7/10/11 5:23:06 AM    ntpd[7969]    time reset -1.050135 s
7/10/11 5:58:13 AM    ntpd[7969]    time reset -1.054077 s
7/10/11 6:33:21 AM    ntpd[7969]    time reset -1.056519 s
7/10/11 7:08:20 AM    ntpd[7969]    time reset -1.035000 s
7/10/11 7:43:24 AM    ntpd[7969]    time reset -1.061526 s
I am using the date and time auto-update in the system preferences with the Apple Time Server. I have the identical setup on two other systems (another MacBook Pro and an intel Mac Mini) and they don't exhibit the problem.
When I disable the auto-update and reset the clock manually using ntpdate and the NIST server, the clock only gains a second in three days with respect to the NIST server (using ntpdate to check). When I turn the auto-update back on the same symptom recurrs.
Any ideas as to what might be causing this and how to fix it?

Barney-15E wrote:
It's not your clock. There is more to network time protocol than just setting the system clock that is in the computer. Take a look here: http://www.meinberg.de/english/info/ntp.htm
Well, that's very interesting. Thanks. But it doesn't explain why only one out of three identically configured computers manifests the symptom.

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Attachments:
datasockettest2.vi ‏32 KB

System Clock Apparently Gaining One Second Every 45 Minutes

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