System Clock keeps drifting forward
 

the time on system clock given with 'date' command keeps moving forward about 1 minute for every hour of realtime. The box is up all the time so this is not an issue with motherboard battery. An equivalent box with the same hardwre/OS and applications doesn't have the same level of drift. I'm not sure what else this could be.
Both boxes are Centos 5.2 64-bit.

thanks for any suggestions

Is this a virtual server?

You can run as root:
That will set the correct time. To keep the time from drifting you can turn on ntpd.

my concern that even without ntp the time shouldn't drift that much.
what would cause it to drift this much forward?
it's not a virtual box btw.