 Integration of a multi-core chip can lower the chip production yields.They are also more difficult to manage thermally than lower-density single-core designs.Intel has partially countered this first problem by creating its quad-core designs by combining two dual-core ones on a single die with a unified cache, hence any two working dual-core dies can be used, as opposed to producing four cores on a single die and requiring all four to work to produce a quad-core CPU.