I've been mining for quite some time now & just recently added an additional 7970 to my main rig.  I've currently got an MSI R7970 Lightning & a Sapphire 7970 Ghz Edition Vapor-X that I just added.  I do not have them crossfired, as I hear it's better to just let them mine independently, right?

The question I have is this.

Generally my 7970 Lightning sits at 99% utilization 24/7 with no issue.  The 7970 Ghz Edition does some quirky things though.  I've been keeping an eye on the utilization of it & whenever it peaks & actually hits 100%(which my Lightning never actually does), it drops down for a matter of seconds to about 60% utilization.  It then goes right back up to 99%, but then a few seconds later hits 100% & process starts all over. 

It's not a huge issue, but I'd certainly prefer to just have to churn away at a steady 99% like the other card, as I'd assume a steady utilization has to be better for the card than bouncing back & forth every few seconds, right?

Any ideas?

Thanks!