Nah, if they are no good then most likely the system will be unstable with them unlocked. If so then you just go back into the BIOS and lock them again
It's possible it wont be able to boot if the cores are defective. In that case I'm pretty sure the motherboard itself will relock them after a few failed boot attempts. If not then at worst you will need to reset the BIOS settings which involves taking a jumper off your motherboard then putting it back on.
Please tell that whether this graphic card ie.
MSI R5770 Hawk Radeon HD 5770 1GB 128-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card
will fit into my mother board which is having one PCI express 2.0 x 16 slot.
what is difference between the 2.0 and 2.1 slot.