Possible culprits (other than a bad card):
1: GPU overheat. Monitor temps if you can at full load.
2: Not enough juice. What PSU do you have because an AX 850 should be able to handle a 7970 (shouldn't it?)?
3: MSAA. I have had huge problems with driver 12.4 when MSAA is enabled. Vertical blocks appear and it isn't pretty. 12.3 and 12.2 worked well with the MSAA.
Hope this helps, gl!
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