Inline cache: A memory cache that resides next to the CPU, but shares the same system bus as other subsystems in the computer. It is faster than lookaside cache, but slower than a backside cache.
Backside cache: A level 2 memory cache that has a dedicated channel to the CPU, enabling it to run at the full speed of the CPU.
Lookaside cache: A memory cache that shares the system bus with main memory and other subsystems. It is slower than inline caches and backside caches.
More info here Intel Cache Overview