Where is the cache on the motherboard?
When talking about the computer's data cache, (i.e., L1, L2, and L3) it's usually on the computer processor chip and not on the motherboard. The L1 cache, or system cache, is the fastest cache and is always on the computer processor. The next fastest cache, L2 cache, and L3 cache, are also often on the processor chip and not the motherboard. Some earlier computers (e.g., 486 computers) had either of these types of cache on the motherboard and had L2 cache expansion boards that could be added to the computer.
The L2 and L3 cache is on the processor chip and is not built into the CPU.