Work up to a point which is stable, then you can look at BIOS mod and overvolting to get more stability. Start with 20mhz increase on the core clock, the 660 can get unstable very quickly. I found ram on these cards to be overclocked by 300mhz quite easily, but as is usual in overclocking, dont increase too much at once. If i had an unstable overclock it pretty much crashed straight away in the "Graphics Test 1". I found MSI afterburner more practical for monitoring your power, voltage and mhz stability, and offers the same overclocking performance.īack at OP, have you checked if it crashes at stock clocks? I found the best test for me was 3dmark11. EVGA precision X was a pain in the arse for me, it looked pretty though. the 310.70 drivers seem to be pretty good, stable, allow better overclocks than the newest 310.90. I found it to be worse and more unstable with the latest driver release. these cards throttle up and down all the time depending on load, temperature, power consumption, they are a real ah heck to overclock and keep at a stable MHZ. all that does is keep it at the maximum 1.175v "boost voltage" instead of dropping.
I think u can also increase the voltage using EVGA precision X
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