As far as I know, the cards have thermal throttling, and the Fan speed/Power Consumption/processors speed/memory clock all balance together. So then, if you boost the processors/memory clock, doesn't it get throttled automatically by the higher temperature?
I've been using MSI Afterburner to tweak my Nvidia GPUs, you can set profiles and it re-applies them at boot time. CPU-Z is a good utility that can show what limits the graphics cards, whether it is power/speed/thermal limit.
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