The eighth generation of Intel processors, also codenamed Coffee Lake, require motherboards based on a set of system logic Intel 300 series. They have lost backward compatibility with the Intel 100 and 200 series chipsets, although they use the same LGA1151 processor connector.
Intel claims that despite the identical connector, Coffee Lake processors have specific electrical requirements that are caused by an increase in the number of computing cores. However, it does not explain why new 4-core processors can not work on old chipsets.
However, new information indicates that the restriction on the use of Coffee Lake processors in conjunction with Intel 100 and 200 chipsets is artificial, aimed at encouraging users to buy a new motherboard for the new processor.
Given the compatibility at the level of the LGA1151 connector, computer enthusiasts were able to not only install the Coffee Lake processors in motherboards based on the Intel 100 series chipsets and 200, but also successfully launch them, forcing, therefore, to work on old "incompatible" platforms. In fact, Intel uses special software to prevent the launch of Coffee Lake processors on older platforms. This software is presented as a microcode for processors, the iGPU UEFI GOP driver and some Management Engine boot modules on the motherboard side of the motherboard. This software allows you to recognize new chips and block their work on older systems. Enthusiasts were able to transfer the required versions of the specified software to the old platforms and, thereby, "make friends" with the new processors. At the same time, it was possible not only to ensure the possibility of the Coffee Lake processors working on motherboards based on Intel 100 and 200 chipsets, but also to eliminate some problems of stability and compatibility.
- Earlier, Intel itself stated that the Coffee Lake processors had lost compatibility with existing motherboards due to hardware differences - a new configuration of the processor socket contacts. In particular, for Coffee Lake processors, more contacts are needed to supply the energy of the computational cores (VCC) - 146. For comparison, the Kaby Lake and Skylake chips were satisfied with 128 VCC contacts.