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post #2 of (permalink) Old 08-01-2018, 08:33 AM
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FCLK is responsible for connecting the PCI-E controller to the rest of the system agent/ring bus.


Most parts will not be stable at 1.5GHz FCLK and you cannot stress/test FCLK with CPU/memory tests like Prime95 as they will never touch PCI-E. Errors on PCI-E from an excessive FCLK could easily cause GPU related issues.

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