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According to the information you provided in this thread I would like to answer your question about this BIOS error code. However, it is important to keep on mind this product is currently end of interactive support.
The 19F error code is generated by the BIOS when facing unsupported stepping configurations with the processors. My recommendations are:
*Check the sSpec Number in this 2 processors. Besides, the model is supported by the motherboard; the stepping number should be the same. You can find these details at the top of the processors.
*In second place, try the firmware update.