[SOLVED] Upgrading gpu is it safe to use 6 to 8pin adapter for power?

Jan 25, 2020
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Hi everyone!
I just purchased asus o6g gtx 1660s to change my sapphire amd hd7850 but it used a 6 pin connector as supply but my new gpu needs an 8 pin connector. Is it safe to use a 6to8 pin adapter?
my supply unit is integrated in my case and its model is: Cooler Master RS-500-PCAP-I3 500W
 
Jan 25, 2020
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Guys what do you think I should buy as a new psu? (Considering also the future years). I might also buy a new case would you recommend coolermaster or should I go for another? (My options are rampage,xigmatek, corsair and cooler master)