This message was posted on behalf of Intel Corporation
This is your chipset model; Intel® H81 Chipset Specifications , and based on this model these are the compatible processors Intel® H81 Chipset Specifications. Both processors are listed on that link; however, in this case we strongly recommend contacting the motherboard manufacturer for compatibility information, they should be able to provide a list of the compatible processors for your model.
Just because the chipset and socket happen to support a particular processor being plugged in does not mean that the processor is supported. First of all, the BIOS may not have the microcode updates necessary to support this processor. Secondly, many system vendors implement a white list in their BIOS and it will only support the processors that they provide and will only support the peripheral devices that they sell you. It's slimy, I know, but a reality. What you need to do is contact Lenovo and ask them them what processors they are going to support.