No, you cannot do that. You'll brick your card! Which drivers are you using? Try to decrease your core and memory under-volt and see if it makes any difference. Moreover, use the latest blockchain drivers and claymore 10.
Currently I'm using r0binhood's drivers from
https://bitcointalk.org/index.php?topic=2068446.0. My core is operating on 1162MHz, and mem volt is 1000mv, so can you please suggest me what values to try for them?
Tnx.
Well, Uninstall your previous drivers and install this one instead,
Driver Link use claymore 10.0 with this driver and it should permanently fix your issue.