I got CPU settings on my BIOS from a hackintosh forum.

Which CPU settings are usable in my k555lb bios? The overclocking setting also unlocked.

All of them are usable

But some of them bricks your bios.

No CPU settings can brick your BIOS. Actually there’s no BIOS setting you can change that will brick your BIOS, unless it happens by strange coincidence to brick on reboot no matter what you did, but it wouldn’t be due to setting choices
You can however change some display/graphics settings in a laptop that would disable your display (So black screen, but that’s not bricked)