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Call me a cheapskate looking for performance, but I have a Sempron 145 processor that has been unlocked to an Athlon II X2 4450e with a GIGABYTE GA-990FXA-UD3 motherboard, but only one of the two processor cores can be used at a time. If both of the cores are enabled in the BIOS the kernel will hang during boot, If I reboot the system and disable the second core (but not re-lock the processor), it will take me to the grub and then start normally. Is there a way to enable both cores and boot without kernel hangs?

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They do core locking for a reason, you know, usually because two cores don't work reliably well. For some, there are only ocasional lockups or other little glitches. In your case, however, it appears to be more serious. – mikewhatever Oct 22 '12 at 0:40

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