B7 Q_Code

Greetings to all. I encountered a problem after some changes for CPU in the bios. My PC won’t boot anymore, q-code states b7. Tried to remove cmos, it didn’t help. My question is, do I need to flash bios with USB? Thank you in advance

I just bought a new GTX 970 Jetstream edition by Palit. My problem is that it is overclocked to 1350mhz by default and I am a little worried that even though it is probably safe and won't overheat the card, it will still cause wearing to the card in the long run. So I want to underclock it and...