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Could be faulty card (reports of faulty memory/vbios ? in some cards).
But also if you use 3rd party oc app with wattman enabled was known ? to conflict.
For troubleshooting, you could try uninstalling(reset to stock first) oc app, also reset(and/or disable) wattman.
Another option is to try under clocking memory down to between 1250-1400(if that works, i would contact the cardmaker support, as that would suggest card fault).
Above is assuming you have ruled out other 3rd party software conflicts, psu/hdd/ram faults.
I have a clean install of Windows 8.1.. no 3rd party oc apps... I have issues with the system freezing when installing the drivers, after the install, and running any application, game or browser. It's intermittent, random, and doesn't happen consistent to any pattern. I have new memory and a new hard drive. The only thing I have not done is under clock the GPU memory. I will try that next. Thanks!
Is Win8.1 Fully updated?
** Windows 7 and Windows 8.1 must be fully updated before attempting to install any AMD driver. All 'critical', 'recommended', and 'optional' (no language packs,etc) updates as well as any Service Packs (SP) must be installed before any attempt to install graphics drivers. If you do not get this message .... keep installing until you do: