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L2 and L3 are not at all the same thing. On recent Intel designs, L1/L2 are per-core and small (32k L1 I$ & D$ / 256k unified L2), while L3 is inclusive and shared by the GPU and all cores. L1/L2 are physically separate, but kind of serve similar purposes (i.e. making memory access fast for a single core). The inclusive L3 has another purpose: coherency between cores (and the GPU). See @DavidSchwartz's answer.
– Peter Cordes
Commented Jul 11, 2015 at 4:17

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