Manual overclocking has once more become more complicated with this generation. Since the cards are always running in the power limiter, you can no longer just dial-in stable clocks for the highest boost state to find the maximum overclock. The biggest issue is that you can't just reach that state reliably, so your testing is limited to whatever frequency your test load is running at (which usually changes all the time). That's why we're changing how we report overclocked GPU frequencies. Instead of listing the highest clock (that's only active for a short moment), we measure average GPU clock over a longer time period and report that value—which represents real-life experience much better.
With manual overclocking, maximum overclock of our sample is 1900 MHz on the memory (27% overclock) and +140 MHz to the GPU's base clock, which increases average GPU clock from 1950 MHz to 2045 MHz (5% overclock).
|Maximum Overclock Comparison|
|Avg. GPU Clock||Max. Memory Clock|
|EVGA GTX 1660 Ti XC Black||2041 MHz||1880 MHz|
|MSI GTX 1660 Ti Gaming X||2045 MHz||1900 MHz|
|MSI GTX 1660 Ti Ventus||2002 MHz||1880 MHz|
|Zotac GTX 1660 Ti||1945 MHz||1650 MHz|
Overclocked PerformanceUsing these clock frequencies, we ran a quick test of Unigine Heaven to evaluate the gains from overclocking.
Actual 3D performance gained from overclocking is 9.6%.