Strange sounds from Mac Pro

Strange clicks going from Mac Pro soon after power up.
It may going from memory cage when temperature of memory is rising.
Any ideas?

Or the graphic card if it has a fan. Or the fans if one is loose.
You should at least for awhile monitor the temperatures with one of the free/shareware utilities. If you push the system, you might even want to boost the fans from their default.
Try running Apple Hardware Test after you check for dust, loose cards. Could it be the PSU?

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